Attempt to create a Rack & Pinion / Worm Gear with an Acme Screw
The updated pinion is definitely an improvement.
wormgear438.stl is for 0.438 pitch diameter screws.
Inch dimensions. The pinions should be compatible with a 5 threads per inch, 1 inch pitch diameter acme screw.
Filenames containing "438" are for 0.438 pitch diameter, 10 threads per inch screws.