DIY Filament Extruder
This Filament Extruder is based on the design by Hugh Lyman with the instruction to build by Ian McMill of the Instructables as per this link:
Why did I build my own Filament Extruder, because commercial filament here in Australia cost around AUD$48 to $56 per kilo of filament, building this extruder was around AUD$120, and raw pellets of filament cost me AUD$12.50 per kilo.
I used the following materials to build my Filament Extruder:
- 1 x Galvanised Pipe 15mm x 250mm
- 1 x Auger Drill Bit 14mm
- 1 x Madza 626 front Wiper Screen Motor
- 2 x PID 220VAC Temperature Controllers + Solid State Relay + Thermocoupler, as a bundle
- 2 x Heater Band 220VAC 100W 30mm x 35mm
- 1 x DC Motor Controller 12V DC 40A
- 1 x Brass 15mm Extension
- 4 x Brass 15mm End Cap
- 1 x Fan 120mm 12V DC
- 1 x Fan 80mm 12V DC
- Miscellaneous items such as wood, wires etc.
I used my MeasumaX micrometer to measure my set of small drill bits here are the results:
Drill Bit = Measured
1.2 = 1.293 1.5 = 1.476 1.8 = 1.782
1.3 = 1.297 1.6 = 1.568
1.4 = 1.383 1.7 = 1.686
So I drilled the brass end cap with 1.6mm
First attempt didn't workout to well , temperature was set to 180 degrees celsius, 14 rpm which produced filament average diameter of around 2.3 mm, way above 1.75 mm I wanted. I slowly increase the temperature maintaining 14 rpm, at 200 degrees celsius I continue to produce an average diameter of around 2 mm. I drilled another brass end cap using 1.3 (1.297) mm drill bit, and ran the process again. This time at 190 degrees celcius it produced an average diameter of 1.7324 mm - at 14 rpm I successfully produced 0.25 KG in 1 hour, this means the extruder should have the capabilities to produced 1 KG of filament in 4 hours. The next day with the same setting it produced an average of 1.7984 mm. I have no idea why.