This is for the Keyboard contest entry. The file is unchanged from my original, simply making another entry for submission date.

In prusa slicer I recommend turning on seam position to the rear (under layers and perimeters)  when making a bunch of these keys. To me it looks more tidy than random seam breaks around the keys.

For the top of the key turning on Archimedean Chords on bottom fill pattern looks nice. I've noticed with this setting on though there are gaps sometimes,  adding small steps of .05 to Extrusion multiplier (under filament settings) normally fixes the problem.

Keycap works with standard MX stems and Kalih.

I've only attempted this with PLA and PETG at 0.2mm.

Filament in photo is Hatchbox Dark Green PETG.