diff --git a/src/wasm-lib/derive-docs/src/lib.rs b/src/wasm-lib/derive-docs/src/lib.rs
index 790b367df..359ca9139 100644
--- a/src/wasm-lib/derive-docs/src/lib.rs
+++ b/src/wasm-lib/derive-docs/src/lib.rs
@@ -837,7 +837,7 @@ fn generate_code_block_test(fn_name: &str, code_block: &str, index: usize) -> pr
 
             // Read the output file.
             let actual = image::io::Reader::open(output_file).unwrap().decode().unwrap();
-            twenty_twenty::assert_image(&format!("tests/outputs/{}.png", #test_name_str), &actual, 1.0);
+            twenty_twenty::assert_image(&format!("tests/outputs/{}.png", #test_name_str), &actual, 0.99);
 
         }
     }
diff --git a/src/wasm-lib/derive-docs/tests/args_with_lifetime.gen b/src/wasm-lib/derive-docs/tests/args_with_lifetime.gen
index 278a890b0..6209de59d 100644
--- a/src/wasm-lib/derive-docs/tests/args_with_lifetime.gen
+++ b/src/wasm-lib/derive-docs/tests/args_with_lifetime.gen
@@ -86,7 +86,7 @@ mod test_examples_someFn {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_someFn0"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 }
diff --git a/src/wasm-lib/derive-docs/tests/args_with_refs.gen b/src/wasm-lib/derive-docs/tests/args_with_refs.gen
index 38ec2a01d..06dc47da6 100644
--- a/src/wasm-lib/derive-docs/tests/args_with_refs.gen
+++ b/src/wasm-lib/derive-docs/tests/args_with_refs.gen
@@ -86,7 +86,7 @@ mod test_examples_someFn {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_someFn0"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 }
diff --git a/src/wasm-lib/derive-docs/tests/array.gen b/src/wasm-lib/derive-docs/tests/array.gen
index aa5e11c5d..6150ceede 100644
--- a/src/wasm-lib/derive-docs/tests/array.gen
+++ b/src/wasm-lib/derive-docs/tests/array.gen
@@ -86,7 +86,7 @@ mod test_examples_show {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_show0"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 
@@ -176,7 +176,7 @@ mod test_examples_show {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_show1"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 }
diff --git a/src/wasm-lib/derive-docs/tests/box.gen b/src/wasm-lib/derive-docs/tests/box.gen
index 5b9a69488..c501a6680 100644
--- a/src/wasm-lib/derive-docs/tests/box.gen
+++ b/src/wasm-lib/derive-docs/tests/box.gen
@@ -86,7 +86,7 @@ mod test_examples_show {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_show0"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 }
diff --git a/src/wasm-lib/derive-docs/tests/doc_comment_with_code.gen b/src/wasm-lib/derive-docs/tests/doc_comment_with_code.gen
index 365908650..b0a72b258 100644
--- a/src/wasm-lib/derive-docs/tests/doc_comment_with_code.gen
+++ b/src/wasm-lib/derive-docs/tests/doc_comment_with_code.gen
@@ -88,7 +88,7 @@ mod test_examples_my_func {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_my_func0"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 
@@ -178,7 +178,7 @@ mod test_examples_my_func {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_my_func1"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 }
diff --git a/src/wasm-lib/derive-docs/tests/lineTo.gen b/src/wasm-lib/derive-docs/tests/lineTo.gen
index 09b3cf534..14e51e6b2 100644
--- a/src/wasm-lib/derive-docs/tests/lineTo.gen
+++ b/src/wasm-lib/derive-docs/tests/lineTo.gen
@@ -88,7 +88,7 @@ mod test_examples_line_to {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_line_to0"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 
@@ -178,7 +178,7 @@ mod test_examples_line_to {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_line_to1"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 }
diff --git a/src/wasm-lib/derive-docs/tests/min.gen b/src/wasm-lib/derive-docs/tests/min.gen
index 69d4aac66..eedaa72bd 100644
--- a/src/wasm-lib/derive-docs/tests/min.gen
+++ b/src/wasm-lib/derive-docs/tests/min.gen
@@ -86,7 +86,7 @@ mod test_examples_min {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_min0"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 
@@ -176,7 +176,7 @@ mod test_examples_min {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_min1"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 }
diff --git a/src/wasm-lib/derive-docs/tests/option.gen b/src/wasm-lib/derive-docs/tests/option.gen
index dbcf16778..099249b98 100644
--- a/src/wasm-lib/derive-docs/tests/option.gen
+++ b/src/wasm-lib/derive-docs/tests/option.gen
@@ -86,7 +86,7 @@ mod test_examples_show {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_show0"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 }
diff --git a/src/wasm-lib/derive-docs/tests/option_input_format.gen b/src/wasm-lib/derive-docs/tests/option_input_format.gen
index 015c9f88f..6496e6a42 100644
--- a/src/wasm-lib/derive-docs/tests/option_input_format.gen
+++ b/src/wasm-lib/derive-docs/tests/option_input_format.gen
@@ -86,7 +86,7 @@ mod test_examples_import {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_import0"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 }
diff --git a/src/wasm-lib/derive-docs/tests/return_vec_box_sketch_group.gen b/src/wasm-lib/derive-docs/tests/return_vec_box_sketch_group.gen
index 508a4262e..5cc8622ca 100644
--- a/src/wasm-lib/derive-docs/tests/return_vec_box_sketch_group.gen
+++ b/src/wasm-lib/derive-docs/tests/return_vec_box_sketch_group.gen
@@ -86,7 +86,7 @@ mod test_examples_import {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_import0"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 }
diff --git a/src/wasm-lib/derive-docs/tests/return_vec_sketch_group.gen b/src/wasm-lib/derive-docs/tests/return_vec_sketch_group.gen
index d966115c5..9f5e170eb 100644
--- a/src/wasm-lib/derive-docs/tests/return_vec_sketch_group.gen
+++ b/src/wasm-lib/derive-docs/tests/return_vec_sketch_group.gen
@@ -86,7 +86,7 @@ mod test_examples_import {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_import0"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 }
diff --git a/src/wasm-lib/derive-docs/tests/show.gen b/src/wasm-lib/derive-docs/tests/show.gen
index bb3ab3302..6bc83e0da 100644
--- a/src/wasm-lib/derive-docs/tests/show.gen
+++ b/src/wasm-lib/derive-docs/tests/show.gen
@@ -86,7 +86,7 @@ mod test_examples_show {
         twenty_twenty::assert_image(
             &format!("tests/outputs/{}.png", "serial_test_example_show0"),
             &actual,
-            1.0,
+            0.99,
         );
     }
 }
diff --git a/src/wasm-lib/tests/executor/main.rs b/src/wasm-lib/tests/executor/main.rs
index acbdf0bb8..01f5591f5 100644
--- a/src/wasm-lib/tests/executor/main.rs
+++ b/src/wasm-lib/tests/executor/main.rs
@@ -4,6 +4,10 @@ use kcl_lib::{
     settings::types::UnitLength,
 };
 
+/// The minimum permissible difference between asserted twenty-twenty images.
+/// i.e. how different the current model snapshot can be from the previous saved one.
+const MIN_DIFF: f64 = 0.99;
+
 // mod server;
 
 async fn new_context(units: UnitLength) -> Result<ExecutorContext> {
@@ -83,35 +87,35 @@ const part002 = startSketchOn(part001, here)
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/sketch_on_face.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/sketch_on_face.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
 async fn serial_test_riddle_small() {
     let code = include_str!("inputs/riddle_small.kcl");
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/riddle_small.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/riddle_small.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
 async fn serial_test_lego() {
     let code = include_str!("inputs/lego.kcl");
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/lego.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/lego.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
 async fn serial_test_pipe_as_arg() {
     let code = include_str!("inputs/pipe_as_arg.kcl");
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/pipe_as_arg.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/pipe_as_arg.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
 async fn serial_test_pentagon_fillet_sugar() {
     let code = include_str!("inputs/pentagon_fillet_sugar.kcl");
     let result = execute_and_snapshot(code, UnitLength::Cm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/pentagon_fillet_sugar.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/pentagon_fillet_sugar.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -139,14 +143,14 @@ const part002 = startSketchOn(part001, "start")
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/sketch_on_face_start.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/sketch_on_face_start.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
 async fn serial_test_mike_stress_lines() {
     let code = include_str!("inputs/mike_stress_test.kcl");
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/mike_stress_test.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/mike_stress_test.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -174,7 +178,7 @@ const part002 = startSketchOn(part001, "END")
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/sketch_on_face_end.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/sketch_on_face_end.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -205,7 +209,7 @@ const part002 = startSketchOn(part001, "END")
     twenty_twenty::assert_image(
         "tests/executor/outputs/sketch_on_face_end_negative_extrude.png",
         &result,
-        0.999,
+        MIN_DIFF,
     );
 }
 
@@ -242,7 +246,7 @@ async fn serial_test_basic_fillet_cube_start() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/basic_fillet_cube_start.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/basic_fillet_cube_start.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -259,7 +263,7 @@ async fn serial_test_basic_fillet_cube_end() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/basic_fillet_cube_end.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/basic_fillet_cube_end.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -279,7 +283,7 @@ async fn serial_test_basic_fillet_cube_close_opposite() {
     twenty_twenty::assert_image(
         "tests/executor/outputs/basic_fillet_cube_close_opposite.png",
         &result,
-        0.999,
+        MIN_DIFF,
     );
 }
 
@@ -299,7 +303,7 @@ async fn serial_test_basic_fillet_cube_next_adjacent() {
     twenty_twenty::assert_image(
         "tests/executor/outputs/basic_fillet_cube_next_adjacent.png",
         &result,
-        0.999,
+        MIN_DIFF,
     );
 }
 
@@ -319,7 +323,7 @@ async fn serial_test_basic_fillet_cube_previous_adjacent() {
     twenty_twenty::assert_image(
         "tests/executor/outputs/basic_fillet_cube_previous_adjacent.png",
         &result,
-        0.999,
+        MIN_DIFF,
     );
 }
 
@@ -341,7 +345,7 @@ const fnBox = box(3, 6, 10)
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/function_sketch.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/function_sketch.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -364,7 +368,7 @@ const thing = box([0,0], 3, 6, 10)"#;
     twenty_twenty::assert_image(
         "tests/executor/outputs/function_sketch_with_position.png",
         &result,
-        0.999,
+        MIN_DIFF,
     );
 }
 
@@ -382,7 +386,7 @@ async fn serial_test_execute_with_angled_line() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/angled_line.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/angled_line.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -408,7 +412,7 @@ const bracket = startSketchOn('XY')
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/parametric.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/parametric.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -442,7 +446,7 @@ const bracket = startSketchAt([0, 0])
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/parametric_with_tan_arc.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/parametric_with_tan_arc.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -470,7 +474,7 @@ async fn serial_test_execute_i_shape() {
     let code = include_str!("inputs/i_shape.kcl");
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/i_shape.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/i_shape.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -479,7 +483,7 @@ async fn serial_test_execute_pipes_on_pipes() {
     let code = include_str!("inputs/pipes_on_pipes.kcl");
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/pipes_on_pipes.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/pipes_on_pipes.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -487,7 +491,7 @@ async fn serial_test_execute_cylinder() {
     let code = include_str!("inputs/cylinder.kcl");
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/cylinder.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/cylinder.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -495,7 +499,7 @@ async fn serial_test_execute_kittycad_svg() {
     let code = include_str!("inputs/kittycad_svg.kcl");
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/kittycad_svg.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/kittycad_svg.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -523,7 +527,7 @@ const pt2 = b2.value[0]
     twenty_twenty::assert_image(
         "tests/executor/outputs/member_expression_sketch_group.png",
         &result,
-        1.0,
+        MIN_DIFF,
     );
 }
 
@@ -536,7 +540,7 @@ async fn serial_test_helix_defaults() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/helix_defaults.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/helix_defaults.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -551,7 +555,7 @@ async fn serial_test_helix_defaults_negative_extrude() {
     twenty_twenty::assert_image(
         "tests/executor/outputs/helix_defaults_negative_extrude.png",
         &result,
-        1.0,
+        MIN_DIFF,
     );
 }
 
@@ -564,7 +568,7 @@ async fn serial_test_helix_ccw() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/helix_ccw.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/helix_ccw.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -576,7 +580,7 @@ async fn serial_test_helix_with_length() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/helix_with_length.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/helix_with_length.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -591,7 +595,7 @@ async fn serial_test_dimensions_match() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/dimensions_match.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/dimensions_match.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -608,7 +612,7 @@ const body = startSketchOn('XY')
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/close_arc.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/close_arc.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -634,7 +638,7 @@ let thing = box(-12, -15, 10)
 box(-20, -5, 10)"#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/negative_args.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/negative_args.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -647,7 +651,7 @@ async fn serial_test_basic_tangential_arc() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/tangential_arc.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/tangential_arc.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -660,7 +664,11 @@ async fn serial_test_basic_tangential_arc_with_point() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/tangential_arc_with_point.png", &result, 0.999);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/tangential_arc_with_point.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -673,7 +681,7 @@ async fn serial_test_basic_tangential_arc_to() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/tangential_arc_to.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/tangential_arc_to.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -703,7 +711,7 @@ box(-20, -5, 10, 'xy')"#;
     twenty_twenty::assert_image(
         "tests/executor/outputs/different_planes_same_drawing.png",
         &result,
-        0.999,
+        MIN_DIFF,
     );
 }
 
@@ -762,7 +770,7 @@ const part004 = startSketchOn('YZ')
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/lots_of_planes.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/lots_of_planes.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -779,7 +787,7 @@ async fn serial_test_holes() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/holes.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/holes.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -798,7 +806,7 @@ async fn optional_params() {
 const thing = other_circle([2, 2], 20)
 "#;
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/optional_params.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/optional_params.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -834,7 +842,7 @@ const part = roundedRectangle([0, 0], 20, 20, 4)
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/rounded_with_holes.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/rounded_with_holes.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -842,7 +850,7 @@ async fn serial_test_top_level_expression() {
     let code = r#"startSketchOn('XY') |> circle([0,0], 22, %) |> extrude(14, %)"#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/top_level_expression.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/top_level_expression.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -859,7 +867,7 @@ const part =  startSketchOn('XY')
     twenty_twenty::assert_image(
         "tests/executor/outputs/patterns_linear_basic_with_math.png",
         &result,
-        0.999,
+        MIN_DIFF,
     );
 }
 
@@ -872,7 +880,7 @@ async fn serial_test_patterns_linear_basic() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/patterns_linear_basic.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/patterns_linear_basic.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -888,7 +896,7 @@ async fn serial_test_patterns_linear_basic_3d() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/patterns_linear_basic_3d.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/patterns_linear_basic_3d.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -903,7 +911,7 @@ async fn serial_test_patterns_linear_basic_negative_distance() {
     twenty_twenty::assert_image(
         "tests/executor/outputs/patterns_linear_basic_negative_distance.png",
         &result,
-        0.999,
+        MIN_DIFF,
     );
 }
 
@@ -919,7 +927,7 @@ async fn serial_test_patterns_linear_basic_negative_axis() {
     twenty_twenty::assert_image(
         "tests/executor/outputs/patterns_linear_basic_negative_axis.png",
         &result,
-        0.999,
+        MIN_DIFF,
     );
 }
 
@@ -941,7 +949,11 @@ const rectangle = startSketchOn('XY')
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/patterns_linear_basic_holes.png", &result, 0.999);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/patterns_linear_basic_holes.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -953,7 +965,11 @@ async fn serial_test_patterns_circular_basic_2d() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/patterns_circular_basic_2d.png", &result, 0.999);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/patterns_circular_basic_2d.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -969,7 +985,11 @@ async fn serial_test_patterns_circular_basic_3d() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/patterns_circular_basic_3d.png", &result, 0.999);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/patterns_circular_basic_3d.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -988,7 +1008,7 @@ async fn serial_test_patterns_circular_3d_tilted_axis() {
     twenty_twenty::assert_image(
         "tests/executor/outputs/patterns_circular_3d_tilted_axis.png",
         &result,
-        0.999,
+        MIN_DIFF,
     );
 }
 
@@ -1009,7 +1029,7 @@ async fn serial_test_import_obj_with_mtl() {
     let code = r#"const model = import("tests/executor/inputs/cube.obj")"#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/import_obj_with_mtl.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/import_obj_with_mtl.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1017,7 +1037,11 @@ async fn serial_test_import_obj_with_mtl_units() {
     let code = r#"const model = import("tests/executor/inputs/cube.obj", {type: "obj", units: "m"})"#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/import_obj_with_mtl_units.png", &result, 0.999);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/import_obj_with_mtl_units.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1025,7 +1049,7 @@ async fn serial_test_import_gltf_with_bin() {
     let code = r#"const model = import("tests/executor/inputs/cube.gltf")"#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/import_gltf_with_bin.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/import_gltf_with_bin.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1033,7 +1057,7 @@ async fn serial_test_import_gltf_embedded() {
     let code = r#"const model = import("tests/executor/inputs/cube-embedded.gltf")"#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/import_gltf_embedded.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/import_gltf_embedded.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1041,7 +1065,7 @@ async fn serial_test_import_glb() {
     let code = r#"const model = import("tests/executor/inputs/cube.glb")"#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/import_glb.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/import_glb.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1049,7 +1073,7 @@ async fn serial_test_import_glb_no_assign() {
     let code = r#"import("tests/executor/inputs/cube.glb")"#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/import_glb_no_assign.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/import_glb_no_assign.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1082,7 +1106,7 @@ const myCube = cube([0,0], 10)
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/cube_mm.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/cube_mm.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1103,7 +1127,7 @@ const myCube = cube([0,0], 10)
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Cm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/cube_cm.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/cube_cm.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1124,7 +1148,7 @@ const myCube = cube([0,0], 10)
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::M).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/cube_m.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/cube_m.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1145,7 +1169,7 @@ const myCube = cube([0,0], 10)
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::In).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/cube_in.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/cube_in.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1166,7 +1190,7 @@ const myCube = cube([0,0], 10)
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Ft).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/cube_ft.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/cube_ft.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1187,7 +1211,7 @@ const myCube = cube([0,0], 10)
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Yd).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/cube_yd.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/cube_yd.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1256,7 +1280,7 @@ const part003 = startSketchOn(part002, "end")
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/sketch_on_face_of_face.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/sketch_on_face_of_face.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1301,7 +1325,7 @@ const part002 = startSketchOn(part001, "end")
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/sketch_on_face_circle.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/sketch_on_face_circle.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1325,7 +1349,11 @@ const part002 = startSketchOn(part001, "end")
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/sketch_on_face_circle_tagged.png", &result, 1.0);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/sketch_on_face_circle_tagged.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1391,7 +1419,7 @@ async fn serial_test_big_number_angle_to_match_length_x() {
     twenty_twenty::assert_image(
         "tests/executor/outputs/big_number_angle_to_match_length_x.png",
         &result,
-        1.0,
+        MIN_DIFF,
     );
 }
 
@@ -1412,7 +1440,7 @@ async fn serial_test_big_number_angle_to_match_length_y() {
     twenty_twenty::assert_image(
         "tests/executor/outputs/big_number_angle_to_match_length_y.png",
         &result,
-        1.0,
+        MIN_DIFF,
     );
 }
 
@@ -1433,7 +1461,7 @@ async fn serial_test_simple_revolve() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/simple_revolve.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/simple_revolve.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1453,7 +1481,7 @@ async fn serial_test_simple_revolve_uppercase() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/simple_revolve_uppercase.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/simple_revolve_uppercase.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1473,7 +1501,7 @@ async fn serial_test_simple_revolve_negative() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/simple_revolve_negative.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/simple_revolve_negative.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1543,7 +1571,11 @@ async fn serial_test_simple_revolve_custom_angle() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/simple_revolve_custom_angle.png", &result, 1.0);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/simple_revolve_custom_angle.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1563,7 +1595,11 @@ async fn serial_test_simple_revolve_custom_axis() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/simple_revolve_custom_axis.png", &result, 1.0);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/simple_revolve_custom_axis.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1587,7 +1623,7 @@ const sketch001 = startSketchOn(box, "end")
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/revolve_on_edge.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/revolve_on_edge.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1638,7 +1674,11 @@ const sketch001 = startSketchOn(box, "END")
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/revolve_on_face_circle_edge.png", &result, 1.0);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/revolve_on_face_circle_edge.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1660,7 +1700,7 @@ const sketch001 = startSketchOn(box, "END")
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/revolve_on_face_circle.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/revolve_on_face_circle.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1686,7 +1726,7 @@ const sketch001 = startSketchOn(box, "end")
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/revolve_on_face.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/revolve_on_face.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1700,7 +1740,7 @@ async fn serial_test_basic_revolve_circle() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/basic_revolve_circle.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/basic_revolve_circle.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1727,7 +1767,11 @@ const part002 = startSketchOn(part001, 'end')
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/simple_revolve_sketch_on_edge.png", &result, 1.0);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/simple_revolve_sketch_on_edge.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1788,7 +1832,7 @@ const plumbus1 = make_circle(p, b,$arc_b, [0, 0], 2.5)
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/plumbus_fillets.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/plumbus_fillets.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1826,7 +1870,11 @@ capScrew([0, 0.5, 0], 50, 37.5, 50, 25)
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/member_expression_in_params.png", &result, 1.0);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/member_expression_in_params.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1944,7 +1992,7 @@ async fn serial_test_xz_plane() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/xz_plane.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/xz_plane.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1958,7 +2006,7 @@ async fn serial_test_neg_xz_plane() {
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/neg_xz_plane.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/neg_xz_plane.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -1985,7 +2033,11 @@ const pattn2 = patternLinear3d({
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/linear_pattern3d_a_pattern.png", &result, 1.0);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/linear_pattern3d_a_pattern.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -2008,7 +2060,11 @@ const pattn2 = patternCircular3d({axis: [0,0, 1], center: [-20, -20, -20], repet
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/circular_pattern3d_a_pattern.png", &result, 1.0);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/circular_pattern3d_a_pattern.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -2037,7 +2093,7 @@ extrude(10, sketch001)
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/array_of_sketches.png", &result, 1.0);
+    twenty_twenty::assert_image("tests/executor/outputs/array_of_sketches.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -2103,7 +2159,7 @@ const sketch001 = startSketchOn(bracket, 'seg01')
     twenty_twenty::assert_image(
         "tests/executor/outputs/sketch_on_face_after_fillets_referencing_face.png",
         &result,
-        1.0,
+        MIN_DIFF,
     );
 }
 
@@ -2140,7 +2196,11 @@ const pattn1 = patternLinear3d({
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/pattern3d_array_of_extrudes.png", &result, 1.0);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/pattern3d_array_of_extrudes.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -2191,7 +2251,7 @@ const baseExtrusion = extrude(width, sketch001)
     twenty_twenty::assert_image(
         "tests/executor/outputs/fillets_referencing_other_fillets.png",
         &result,
-        1.0,
+        MIN_DIFF,
     );
 }
 
@@ -2243,7 +2303,7 @@ const baseExtrusion = extrude(width, sketch001)
     twenty_twenty::assert_image(
         "tests/executor/outputs/chamfers_referencing_other_chamfers.png",
         &result,
-        1.0,
+        MIN_DIFF,
     );
 }
 
@@ -2302,7 +2362,7 @@ const pattn1 = patternLinear3d({
     twenty_twenty::assert_image(
         "tests/executor/outputs/linear_pattern3d_filleted_sketch.png",
         &result,
-        1.0,
+        MIN_DIFF,
     );
 }
 
@@ -2333,7 +2393,7 @@ const pattn2 = patternCircular3d({axis: [0,0, 1], center: [-20, -20, -20], repet
     twenty_twenty::assert_image(
         "tests/executor/outputs/circular_pattern3d_filleted_sketch.png",
         &result,
-        1.0,
+        MIN_DIFF,
     );
 }
 
@@ -2364,7 +2424,7 @@ const pattn2 = patternCircular3d({axis: [0,0, 1], center: [-20, -20, -20], repet
     twenty_twenty::assert_image(
         "tests/executor/outputs/circular_pattern3d_chamfered_sketch.png",
         &result,
-        1.0,
+        MIN_DIFF,
     );
 }
 
@@ -2429,7 +2489,11 @@ const sketch001 = startSketchOn(part001, 'chamfer1')
 "#;
 
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/sketch_on_face_of_chamfer.png", &result, 1.0);
+    twenty_twenty::assert_image(
+        "tests/executor/outputs/sketch_on_face_of_chamfer.png",
+        &result,
+        MIN_DIFF,
+    );
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -2463,21 +2527,21 @@ let p = triangle(200)
 async fn serial_test_global_tags() {
     let code = include_str!("inputs/global-tags.kcl");
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/global_tags.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/global_tags.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
 async fn serial_test_pattern_vase() {
     let code = include_str!("inputs/pattern_vase.kcl");
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/pattern_vase.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/pattern_vase.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
 async fn serial_test_scoped_tags() {
     let code = include_str!("inputs/scoped-tags.kcl");
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/scoped_tags.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/scoped_tags.png", &result, MIN_DIFF);
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -2487,7 +2551,7 @@ async fn serial_test_order_sketch_extrude_in_order() {
     twenty_twenty::assert_image(
         "tests/executor/outputs/order-sketch-extrude-in-order.png",
         &result,
-        0.999,
+        MIN_DIFF,
     );
 }
 
@@ -2498,7 +2562,7 @@ async fn serial_test_order_sketch_extrude_out_of_order() {
     twenty_twenty::assert_image(
         "tests/executor/outputs/order-sketch-extrude-out-of-order.png",
         &result,
-        0.999,
+        MIN_DIFF,
     );
 }
 
@@ -2506,5 +2570,5 @@ async fn serial_test_order_sketch_extrude_out_of_order() {
 async fn serial_test_extrude_custom_plane() {
     let code = include_str!("inputs/extrude-custom-plane.kcl");
     let result = execute_and_snapshot(code, UnitLength::Mm).await.unwrap();
-    twenty_twenty::assert_image("tests/executor/outputs/extrude-custom-plane.png", &result, 0.999);
+    twenty_twenty::assert_image("tests/executor/outputs/extrude-custom-plane.png", &result, MIN_DIFF);
 }
diff --git a/src/wasm-lib/tests/executor/outputs/member_expression_sketch_group.png b/src/wasm-lib/tests/executor/outputs/member_expression_sketch_group.png
index 32fd14022..976dfe3ce 100644
Binary files a/src/wasm-lib/tests/executor/outputs/member_expression_sketch_group.png and b/src/wasm-lib/tests/executor/outputs/member_expression_sketch_group.png differ
diff --git a/src/wasm-lib/tests/executor/outputs/sketch_on_face_end_negative_extrude.png b/src/wasm-lib/tests/executor/outputs/sketch_on_face_end_negative_extrude.png
index 61d8f99c4..8edb56ba3 100644
Binary files a/src/wasm-lib/tests/executor/outputs/sketch_on_face_end_negative_extrude.png and b/src/wasm-lib/tests/executor/outputs/sketch_on_face_end_negative_extrude.png differ