A nice script written by Tim Chandler that I modified to fit my needs. Still got to test the results on the printer, but it was a nice exercise to learn more about OpenScad! http://www.thingiverse.com/apps/customizer/run?thing_id=124706&code=baae82975280da8903a61d35ba6e8ac0 http://www.thingiverse.com/thing:124706 uploaded a new version, the pitch engraving was disappearing at certain dimensions. A little flaw that I corrected by changing the position and orientation of the engraving. 2015-jan-05: Again, corrected mistakes and added a vector to define the dimensions of the bearings. Also added lookup tables that select the correct dimensions for the nuts and other parameters. 2015-jan-08: Increased the base height, reviewed the code and corrected some other details. Printed and tested two parts with 1mm and 2mm pitch. Perfect results!!!