3D Printing


An Unfortunate Discovery
Feb 17, 2006
Spotted Dick, Englandshireford
2020 Tesla Model 3, 1990 Discovery 1 Bobtail
Completed a project on the 3D printer today. I was fed up of scratching my arm when reaching around the back of the machine to turn it on and off, so got hold of a switch on Amazon. A nice green one with illumination. Easy to cut a small hole in the side of the case and then remove the wires from the existing switch. Oddly, the wires that went from the mains IEC socket to the switch and then to the power supply were neutral, but red. The live wires are black, obviously someone was having an off day in the factory. I used proper blue wire from an old mains power lead and wired up the new switch to toggle the neutral as before and used heat shrink to cover as much of the exposed terminals as possible.

Also in this photo are the 24V to 12V dropper boards for the Noctua fans I've now installed and a relay that I will mention another time.

I didn't really pay much attention to the wiring of the LED inside the DPST switch, so just switching one side of the circuit isn't enough to bring the light on. I don't mind...

Half an hour later and the incorrect coloured wire combined with the want for illumination meant I made up two new live wires in shit-your-pants brown to match. That sweet, sweet green light is worth the extra work.