Overview

A 3D printer extruder is a filament feeding mechanism used in all fused deposition modeling (FDM) 3D printers.

This is a list of publicaly available extruder designs which can be built using a combination of 3d printed parts and a purchasable gear kit. Sections are broken up by gear type.

Terminology:

Bowden: An extruder not attached to the toolhead that pushes filament through a PTFE tube.
Direct Drive: An extruder attached to the toolhead that pulls filament through a PTFE tube.
Standalone: A direct-drive extruder that is a seperate assembly from the toolhead.
Mounting: The bolt spacing of the extruder to attach to the toolhead.