This is a small 4 key macropad that I built for someone. 
It uses standard 14x14 mm switches
Compatible with Seeed Xiao RP2040 and Arduino Pro Micro (Untested.)

The 2 parts are held together with 2 standard 15mm M3 screws and heat set inserts.
The heat set inserts go into the smaller holes in the top part. The larger holes are just for alligning the 2 parts.

My RP2040 runs a simple circuit Python program that is also uploaded here.

The fit is a bit tight and planning needs to be done when soldering the connection.

Print Settings:
Layer Height: 0.22mm
4 wall loops
10% infill
4 mm outer brim