Precious Plastic Extruder

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HintLightbulb.png Hint: This work builds upond the precious work of Precious Plastic. We are indebted here to Dave Hakkens. See https://preciousplastic.com/en/videos/download.html

Working Doc

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BOM

  • Wood bit - 1" - [1]. 7/16" shank, as in 1/2" version. Local - [2]
  • Pipe flange - Menards $5 - [3]
  • Pipe flange - pack of 10 - Amazon - $4 ea - [4]
  • 1" pipe -

OSE Version Design Rationale

  • Slow auger version powered by a Nema 17 with large auger.
  • Vertical hang to reduce auger power requirement
  • Remove flow control screw and rely on temperature and auger speed instead. PP version doesn't have speed control on motor, so motor control produces additional control required here

Heuristic Calculations

  • We want low speed equivalent to a strong corded drill such as [5].

Cordeddrilltorque.png.

Lymanmotor.png

  • About 140 in lb for motor above. This should be plenty for an extruder application.
  • If we take a 1A, 12V motor - Nema 17 - that is 1/4 the power of the above.
  • But power for steppers apparently doesn't work like this - as that indicates 600x geardown if we consider power alone. 140 in lb is 140*16 in-oz = 2240 oz in. Then we need 30 geardown for a Nema 17 motor at low speed. That is well doable for a 3D printed geardown.
  • Note that Nema motors retain good torque at 300 RPM, so we obtain 10 RPM within the good torque regime.

CAD - OSE Version


Filament Extruder

Filamenter motor.pngFilamenter auger.pngFilamenter controller.pngFilamenter bearing.pngFilamenter flowcontrol.pngFilamenter overall.pngFilamenter flowadjust.pngFilamenter final.pngFilamenter wallmount.png

Extruder Controller

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BOM Candidates

  • Insulator brick - [7]
  • Carbon fiber welding blanket insulation - [8]
  • Small high torque hydraulic motor - [9] $50
  • Type K Thermocouple - [10] - $7
  • SSR - [11] - $7
  • 1" flange - $4 on amazon - [12] or $5 menards - [13]
  • PID Controller - $23 - [14]
  • PID with SSR + thermocouple - $14 - [15] - got 3.
  • [3] band heaters - 35x45 mm - $4 + SH - [16]
  • [1] band heater - 1.75" for next coupler
  • 1-3/4" coupler - [17]
  • 1.75" heater - [18]

Notes

  • 1.75" is 45 mm
  • 35 mm is 1.38 in
  • 40 mm is 1.57 inches
  • OD of pipe union
  • 1.25" and 1.75" nozzle heaters are available easily - [19]