This is a switch extender for non-fuel Milwaukee M12 cordless ratchets, because the default switch is narrow and inset, making it difficult to use, especially when wearing gloves. This is for the NON-FUEL version of the M12 ratchet. I don't have access to the FUEL version so I'm not sure if it's the same.

This snaps onto the existing toggle switch to reverse the direction of the ratchet, and gives you an easier grip to switch back and forth.

I printed this standing upright with a 0.25mm nozzle, 0.15mm layer height, with supports turned on. It would likely work with a regular 0.4 nozzle but you might need to play around with orientation and support settings. If you use supports on the flat side, I would put the handle side face down, otherwise it may be difficult to remove the supports from the narrow channel that slots onto the ratchet.