Connector (Easy swap)

thingiverse

This lets you switch easily like laser/bowden/direct drive and so on. There are 4 pins dedicated to high power requirements such as Extruded heated. The rest is just for signal wires; wire them as you want. Gold-plated bullet connectors are required (you can get 10 sets for a couple of dollars). There need to be four female and the rest male round pin headers. Drill with a 1.2mm or similar drill bit. Some heat shrink and some prototype PCBs with 2.54mm spacing are also needed, along with two M4x10 bolts. Just solder everything up and you're done. I've attached some images for clarity.