diff --git a/mini-tube.json b/mini-tube.json
index d81959e..452091e 100644
--- a/mini-tube.json
+++ b/mini-tube.json
@@ -18,11 +18,13 @@
 		"2ml-100mm2": {
 			"volume_ml": "2",
 			"cross_section_mm2": "100",
+			"marks_small_ml": "0.2",
 			"text_size_mm": "5"
 		},
 		"5ml-100mm2": {
 			"volume_ml": "5",
 			"cross_section_mm2": "100",
+			"marks_small_ml": "0.2",
 			"text_size_mm": "5"
 		},
 		"5ml-333mm2": {
diff --git a/mini-tube.scad b/mini-tube.scad
index c281d5d..34a5f5b 100644
--- a/mini-tube.scad
+++ b/mini-tube.scad
@@ -13,7 +13,7 @@ wall_thickness_mm = 0.8;
 mark_depth_mm = 0.3;
 mark_width_mm = 0.4;
 
-marks_pre = [[marks_large_ml, 30], [marks_medium_ml, 20], [marks_small_ml, 15]];
+marks_pre = [[marks_large_ml, 30], [marks_medium_ml, 22.5], [marks_small_ml, 15]];
 marks = [for (m = marks_pre) if (m[0] > 0) m];
 
 bottom_thickness_mm = wall_thickness_mm;