These were made so that I could easily tell which buttons my fingers were on in VR. I've only tested them on a CM2 throttle, but they should work with the CM3 and button panels.

I would recommend a brim as the surface area that contacts the build plate is small. It also shouldn't need supports for the overhang since it's about a 1cm bridge.

Blend file is included if you want to mess with how the bumps are arranged. Note that the hole in the bottom isn't perfectly square, it's ever so slightly wider than it is tall.