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diff --git a/3d-printables/caster-standoff.scad b/3d-printables/caster-standoff.scad
index a385735..e18f3a5 100644
--- a/3d-printables/caster-standoff.scad
+++ b/3d-printables/caster-standoff.scad
@@ -8,7 +8,7 @@
 $fn = 60;
 
 /* measured with calipers */
-ball_diameter = 12.7 + 1.125;
+ball_diameter = 12.7 + 0.5; // extra bit added for printing imprecision
 ball_radius = ball_diameter / 2;
 
 wall_thickness = 1;