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| Item | Amount | Description | Source of supply | Comment |
|---|---|---|---|---|
| Extruder Screw | 1 | extruder screw | custom part, steel, drawing/parameters | |
| Extruder Block / Kühlblock | 1 | holds barrel; integrated water cooling | custom part, steel, drawing | |
| Extruder Barrel / Schneckenzylinder | 1 | screws into extruder block | custom part, steel, drawing | |
| Nozzle | 1 | standard 3D printer nozzle; hardened | e.g. https://www.aliexpress.com/item/4000463888666.html | |
| NEMA 23 Stepper Motor with gear box | 1 | use a gear ratio of 1:20 to 1:45 | e.g. https://de.aliexpress.com/item/4000341116560.html longer NEMA23 optional | |
| Shaft Coupler | 1 | shaft coupler 10mm to 12mm | e.g. https://www.aliexpress.com/item/4000002010204.html | |
| Heating Element | 1 | 230V heater spiral, ID=15mm, h=40mm | e.g. https://www.aliexpress.com/item/32629957364.html | wraps around barrel |
| Metal Cage | 1 | several laser cut aluminium aluminum parts | custom parts, aluminium aluminums 3mm, see laser-cutting folder on github | |
| Pellet Inlet | 1 | custom part, PLA, 3d printed, see 3d-printing folder on github | ||
| Pellet Tank | 1 | custom part, PLA, 3d printed, see 3d-printing folder on github | ||
| Temperature Sensor | 1 | standard Termistor of controller boardthermistor for use with 3d printer controller board (e.g. 100K NTC) | e.g. https://www.ebay.de/itm/321913407822 or thermocouple integrated in above or TC inheater element, then use this temperature controller (not compatible with typical 3d printer hardware): https://de.aliexpress.com/item/32954616330.html?spm=a2g0o.cart.0.0.23af3c00hLDu73&mp=1 | |
| M5 x 120 | 4 | steel screw | ||
To run the extruder you will also need :
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a water chiller for cooling. Alternatively, just use a water pump and a water reservoir (>3 liters)
We are currently mainly using PolyMIM materials, as these feedstocks can be debindered easily in a water bath.
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Copyright FabLab München e.V. 2021
Licensed under the CERN-OHL-P v2
You may redistribute and modify this documentation and make products
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