NMO rain cap

This is a threaded cap designed to accept an o-ring and protect an NMO antenna mount when not in use. I designed the part in OpenSCAD using a module that I just wrote for modelling standard threads. My thread module needs a little optimization, so it is not only extremely processor intensive, the resultant STL files are rather large.

NMO-rain-cap-v0.stl should be considered a preview. OpenSCAD exported the file as simple, but Repetier interprets it as non-manifold. The part printed decently with 0.2mm layer height. Yet, without anything to chase the threads, the cap didn't fit an NMO mount. With any luck, I can publish a v1 part soon.

Finish with a 1-7/16" OD x 1/16" o-ring (standard on Larsen antennas). Please share your makes.