2 x 2 gridfinity macropad. Uses mechanical switches and keycaps!

Assembly is very straight forward. You can follow this video if you don't know how to handwire a keyboard. 

The upper part attaches to the bottom part using 8mm M3 screws and M3 threaded inserts like seen in the picture. 

Parts list:

• 9 x Mechanical keyswitch
• 9 x Keycaps
• 1 x Pro Micro (or any other similar microcontroller)
• 2 x M3 threaded insert
• Some wire and diodes