Just some basic flat keycaps that are fairly low profile.

Printing:

Printed flat on the bed on my Anycubic Photon Mono and the stem fits just as well as injection molded parts. Never had much luck printing keycaps on FDM but if your printer is calibrated I don't see why it wouldn't work.

edit 8/28/2021 - i just noticed the names are totally wrong for some of these lol, 25u = 1.25u, 5u = 1.5u i think