OpenSCAD cap with thread generator
As stated here, go to File -> Show Library Folder...
and copy or clone the whole git repository into this folder.
I printed this with a Prusa MK3S on 0.2mm SPEED settings with PETG filament. Use a maximum layer height of 0.2mm, a height of 0.3mm did not work for me.
cap_height = 3 is good for stiff caps up to 50mm.
For faster printing use a higher knurl_spacer setting (to get less knurls), and a thiner cap diameter.
Careful: printing without any knurl makes it very hard to tighten or loosen the cap by hand.
