This is a slightly narrower version of https://www.thingiverse.com/thing:4699978. The main body is 11 mm high instead of 15mm of the original, and the stem is 13mm high instead of 20mm. Overall, this results in a more comfortable position, at least for me, as I'd like the switch to be as far to the left as possible, and the stem no longer protrudes from the switch.
Refer to the original project for more information.