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diff --git a/3d-printables/motor-mount.scad b/3d-printables/motor-mount.scad
index 33533ae..3e96b69 100644
--- a/3d-printables/motor-mount.scad
+++ b/3d-printables/motor-mount.scad
@@ -7,15 +7,14 @@
 $fn = 60;
 
 // from schematic http://goo.gl/96RKol
-collar_radius = 9.2 / 2;
-// subtract a bit to make snap fit
-nubbin_radius = (4.48 - 0.3) / 2;  // make snap fit
-screw_radius = 2.9 / 2 + 0.1; // a little bigger so screws fit through
+collar_radius = 9.2 / 2 + 0.25;
+nubbin_radius = 4.48 / 2;
+screw_radius = 2.9 / 2 + 0.35; // a little bigger so screws fit through
 
 motor_height = 22.23;
 
 // http://freespace.virgin.net/matt.waite/resource/handy/screwsize.htm
-_6_radius = 3.5 / 2;
+_6_radius = 3.5 / 2 + 0.25;
 
 // measurements we made up:
 mount_total_x = 38;