tesla893/printrbot-variant — comment on commit 2424edc20d5377aea99907cd56fbf120a329e003
File: printrbot-variant.scad line 29
By whosawhatsis:

Actually, I intentionally hard-coded the thickness of the motor mount parts to 3. Combined with the geometry of the Y bearing retainers, this makes 10mm screws the right length for mounting the motors. If this changed with rod size, the screw length would have to change too. Also, if it was going to be based on rod size, it would be the size of the threaded rods, not the smooth rods.