ESP key/Weigand case for lab/ testing.
A small, tough case for the Weigand/ESP key sold at Red Team Tools, useful for testing/ learning, simple cut off some jumper/breadboard cables to extend the connections outside of the case.
The areas where the LEDs are on the board are thin enough that light should show through if you print in a light colour PLA, mine are white, but grey should work nicely too.