Hi Barry,

Thank you! This sample 3D printed screw and nut has been sitting on my desk for many years as an inspiration for this type of project sometime or another.
I was having trouble with the nut thread as detailed here:

http://moi3d.com/forum/index.php?webtag=MOI&msg=9685.8

Pilou has a solution by rotating the nut to allow the curve intersection to offset.

Thank you,

Wayne