Variable Belted Extruder

Belted extruder
Gear 3:1
Easy swapable filamentsize by just changing 1 (front) part.

Additional parts:
2 pcs ballbearings 695zz: 5x13x4
1 pc screw M5x35 hex-head
1 pc lock nut M5
1 Extruder Driver Gear Wheel 40Teeth 11mm Bore 5mm (MK7 / MK8)
( https://www.banggood.com/de/2Pcs-MK7-MK8-Extruder-Driver-Feeder-Gear-Wheel-40Teeth-11mm-Bore-5mm-For-3D-Printer-p-1036149.html )
1 pc ballbearing V-nut 623VV (1.75mm filamentsize)
1 pc set screw M3x12 (axis of ballbearing)
1 pc ballbearin