MK3 dual fan

The original part this is a remix of had some problems slicing for me, so I made my own version.

This is a mod for the MK3 which allows dual blower fans on the hot-end for improved cooling. Electrically, you can split the power and ground wires from the existing fan and wire it into the new fan. This works well, actually requires minimal changes, and improves cooling significantly.

Print in polycarbonate to prevent drooping when printing ABS or other high-temperature plastics.