Summary

Mount 12 5mm LED on a Prusa Mendel X-Carriage.

Instructions

Print it!
Solder 4 modules of 3 LED in serie with a 120 ohms resistor on the last LED's cathode. Solder all modules in parallel. Add a 2 wires power connector. Push the LEDs in the mount while working to ensure they will fit once everything is soldered.
Attach the mount to your X-Carriage, wire it to 12v DC power source.
Enjoy the show.

Note: Number of modules, LEDs per module and resistors value depend on your power supply and the specifications of your LEDs. Check your values with http://led.linear1.org/led.wiz.

Led Ring for Prusa Mendel X-Carriage