Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:1701164.

This is a simple light switch for a kossel mini type printer.

What I really wanted to show was that 12 Volt .4 x .1 Waterproof LED strip lights will fit very nicely in 20 series Aluminum extrusions. They put out a lot of light and fit snugly in the channel. I ended up using 2 sets of 9 long LED strips. I soldered wires to the terminals, covered with heat-shrink and wired to the power supply through the switch. You need an open end to slide the strip through.

9 LEDs sit just below the carriages when the nozzle is at Z=0

The hole in the plate fits a KCD11-101 Switch