This is Extruder Driven Gear (Filament Spur) replacement part for the Original Prusa MINI/+. This is the driven/idler gear pushing the filament inside the extruder assembly.

This is Extruder Drive Gear (Motor Pinion) replacement for the Original Prusa MINI/+ extruder motor. This drive gear sits directly on the extruder motor shaft.

Copper gear that is attached to the stepper motor used to drive a BMG Extruder.

BMG Extruder Gear shaft assembly

This product is a replacement screw for the Nextruder compatible with: 

Thumb screw is used to hold the Prusa Nozzle inside the heatsink. For the Nextruder two thumb screws are required.

MK3.9MK4

Idler Spring - for use across Most Prusa models except MK2/s and SL1/CW1

High Quality Titan Extruder Gear with a POM Machined Stepper gear and precision-milled stainless hobb.

This product is a filament sensor for the Nextruder, compatible with: 

MK3.9MK4XL