Prusa MMU2 selector mod

thingiverse

**Update 8/28/19**: I've updated this to mount the spare 10x6mm magnet from Prusa under the FINDA ball. Others have done this before, but I didn't catch the windows I added earlier. I often find that debris is self-ejected from the window, which is a nice feature. I also added a garbage chute to the rear and cleaned up some aspects of printing. You may need to clean up the magnet slot to fit. **Update 8/30/19**: I made a couple tweaks and added back the missing chamfer for cleaner prints (bridge detection). I also added another step. --- The MMU2 is a finicky beast. I added pockets to the selector around the FINDA ball so that there's room for debris to get out of the way of blocking the ball, which is my number one fail mode. I added windows so you can: * Monitor filament loading * Observe the ball status * Set the FINDA height visually * Extract debris mid-print I recommend printing at 0.15 layers to get smoother transitions on the filament path. **To install**, just follow the directions for changing the blade, which requires removal of the selector. Tip: Remove the first zip tie from the finda/selector motor wires. It's not needed and prevents you from backing out the motor for selector maintenance. As you back it out, rotate the body so the wires point to the back for more slack to clear the selector.