T-Slot &/or 20/20 Rocker Switch Box

thingiverse

My FLSUN PRUSA i3 Clone gave me instructions to connect my extruder heat sink fan to the "constant on" 12v power supply on the Makerbase board it came with. This meant that as soon as I powered on the printer, the extruder fan was always on, whether I was printing or not. At first, this seemed like a smart idea because I had no idea how big of a role the fan plays in the printing process. As I later found out, there's actually another 12v fan power supply connector on the board that lets you use g-code commands to turn the fan on and off. After discovering this, I quickly switched over the wiring and started using automated g-code to control the fan. However, sometimes when I was changing print jobs or troubleshooting prints, the fan wouldn't kick back on because it was supposed to be automatic, and I'd forget about it because I was too focused on printing. This led to clogs for days. So, I went back to the original wiring setup. Now that I know more about my printer and the printing process, having that fan always on has become really annoying, especially since I have to replace it every few months because my printer is running almost 24/7. To reduce power draw through my MakerBase board, I decided to create a simple part with an easily accessible switch for turning the fan on or off as needed. The fan will still receive power directly from my power supply. I also added a second switch for my light bar. Here are some printing notes: The rocker switch is available at http://a.co/cTNxCfx.