I created this model after searching for a simple Gridfinity compatible keyboard switch tester. A switch matrix of 4x4 fits nicely on a 2x2 Gridfinity base and allows me to test switches in a numpad configuration. Also makes a nice display of switches to show off your collection.

Stackable lip added (only stacks when empty) with fancy color accent.

Fits all switches I tested using standard 14mmx14mm slots with standard keycaps as well.