LED holder set for Original Prusa i3 mk2. Link for compatible product: These are tight fit parts, so do not print them too fast or too hot for best results. You are free to report any problems you have with these and i will try to fix them. You can assemble led just by pressing it in, with connector in line with hole and disassemble by rotating led. Thanks for 3D_Guru including my design in his video: There he explai how to wire leds straight to the power supply.