Pro Micro 12 key Keypad

thingiverse

I only had to print the base with supports due to the hole that perfectly fits the Arduino Pro Micro. The switches should easily snap right into the holes, I didn't have to file anything down after printing. It's a snug fit but there's enough room to place the Arduino underneath the keycaps. I secured mine using hot glue, but I'm confident a better method exists. The screw holes are precisely designed for 16mm M3 screws.