Designed to fit a 4x4 plate on top. There is room for a switch and a button cell battery.
In the pictured example I used a hot needle to melt two small holes in the 4x4 plate and poked the leads of the LED through it. Then I connected them up to the battery and switch with some simple wire.
Printer:
Ender 3
Rafts:
No
Supports:
No
Resolution:
0.2