Relay Fuse Holder for 3D Printer

thingiverse

I created this as better fused protection that came with my Tronxy motherboard. It also has a mounting system for Automotive relays up to 200A. Although standard blade fuse holders only go up to 40A, you can upgrade your protection by using automotive relays. Make sure to use the "continuous" type, or they will run hot. When it comes to wiring, I recommend using 4mm (8swg) for the Heat bed relay and a 1.5mm (16swg) cable for everything else. There are two additional 6mm finger terminals, also known as 6mm speaker terminals, perfect for connecting led strips or fans with fused protection. You can make them out of M6*30mm nozzle throats with thumb nuts. Don't forget to add two washers and three half nuts for each terminal. This design has two smaller holes on the front for mounting to a 2020 aluminium profile. There are also two slightly larger holes opposite for a screwdriver, making it easy to fix or remove the device.