in the Original article on Thingiverse http://www.thingiverse.com/thing:30199 ,  jasonwelsh asked for an openscad version of his M3 Allen Wrench. Here is one. Not to mention small if you have a large hand. So here is my design for an allen wrench handle.  Features: Swivels on the base Magnetised to hold M3 on tip Easy to tear apart in a pinch I have not explored SCAD but this would make a great candidate.