This is version 2 of the thumb wheel leveling system. It adds thumb wheel leveling to the Monoprice Select Mini printer. Specifically Versions 1 and 2 of the printer.
Version 1 can be found here: https://www.thingiverse.com/thing:2783644
Please note that this mod will not work with the V3 model.
Full instructions can be found in the included PDF file.