MMU Under Shelf Auto Rewind for 2.5kg spools

This remix builds on an existing great design, but just scales it up to fit larger 12"/30cm spools, commonly used for 2.3kg, 2.5kg, or 5lb spools. I have primarily used it with spools from IC3D and Printed Solid, which are roughly 4.25" or 108mm wide.

They still work just fine with smaller spools, and even sample coils. Check out these spacers to add sides , keeping loose coils tidy.

Changes: Frame parts have been expanded. Roller is wider. Spring is thicker, and a touch stiffer. End cap is the same.

I have omitted the Space Guide, and Feeder Mount. You can grab those from the original project if needed.

I find PETG to be the best material for the spring. ABS and PLA haven't lasted as long as the PETG parts. Note that the extra weight of the larger spools does tend to be a bit rougher on the springs, may want to keep a spare on hand.