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The MK7 Extruder Drive Gear fits NEMA 17 stepper motors for direct drive extruders – Build-in grub screw secures it directly to the NEMA 17 shaft.
The Stainless Steel MK8 extruder drive gear is compatible with both 1.75mm and 3mm filament, providing 35% more power due to its small hobbed drive diameter.
This 26 Tooth Extruder Drive Gear is a small part that grips the filament and pushes it through to the hotend, for smooth and consistent filament extrusion.
This is a 40 tooth extruder drive gear that is commonly used on the kossel delta 3D printers.