What is an extruder in a 3D printer?
An extruder is the mechanism that pushes filament into the 3D printer's hotend. Contains a stepper motor and toothed gears that precisely feed filament at the speed and pressure needed for quality printing.
How the extruder works
Extruder has three main components: stepper motor (drives feeding), toothed gears (grip filament) and tensioning mechanism. Filament amount is controlled by G-code via E-step calibration.
Direct drive vs. Bowden
- Direct drive - extruder directly above nozzle. Better for flexible filaments (TPU), more precise retraction. Disadvantage: heavier head.
- Bowden - extruder outside the head, filament travels through a tube. Lighter head = faster printing, but worse with flexibles.
Common problems
Grinding - gears strip filament. Clicking - motor skips steps (clogged nozzle). Under-extrusion - too little filament.
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