This morning I discovered the hard way (at the side of the road with a flat) that the cap on my air pump must have rattled off. I'd never had very good luck printing threaded parts before, but I have a much better tuned printer than I used to have, so I decided to give it a try.It works! Printed in PLA with 0.1mm layer height, created in OpenSCAD and processed with Slic3r, printed on a Prusa i3.I used the OpenSCAD threads library from here: http://dkprojects.net/openscad-threads/If you have a Topeak Pocket Rocket, you can just use the STL. Otherwise grab the two SCAD files and edit. The threads take a LONG time to render (about 5 minutes on a 6 core, 3.5 GHz machine with 8G RAM) so be patient.Slic3r crashed the first time I opened the STL, but worked the 2nd time. Weird.