Belt Geared UM2 Feeder Upgrade

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This is a bolt-on upgrade for the UM2, featuring a belt-drive that significantly boosts the pushing power of its relatively weak feeder motor. It also eliminates thermal coupling between the feeder motor and the knurled bolt, as excessive temperatures at the bolt caused by high current can decrease feeder performance. As a gearbox, it moves the knurled bolt a few centimeters outwards and upwards, and provides a new nema17 hole pattern that enables compatibility with any feeder designed for the standard feeder position on the UM2, including the IRobertI feeder and the original UM2 feeder. It achieves a gearing of 1.8:1 and removes almost all thermal coupling between the motor and the knurled bolt. To utilize this geared feeder upgrade, simply adjust the steps per mm in Marlin to the original value multiplied by 1.8 – that's it! You'll need to print one base, one plate, and two washers. The files also include a Bearing Carrier for using MF105 (5x10x4mm) bearings instead of the MF695. If you plan to use it with the |Robert| V2 feeder, we recommend printing the feeder mirrored, ensuring it doesn't interfere with the original spool holder. This requires adjusting the direction of the feeder in the firmware. As a bonus, this modification lowers the friction slightly in the bowden tube since the knurled surface of the filament will be on the inside instead of the outside of the bowden tube's curve.