threads-scad
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thread fix
this pr just repackages the fix and test submitted by @nobodyinperson (thank you!), and applies the edit requested by @rcolyer, so it can hopefully be merged. having meshing internal and external threads is pretty important!
Does this mean I just started a print where my internal and external threads aren't going to mesh?
After that print finished, the threads didn't mesh. I pulled in @ellemenno 's changes and reprinted and the threads still didn't mesh but they were a little better. I'm assuming the issue I'm having is related to the precision of my printer so I'm just increasing the diameter of the internal threads by 2%.