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Heat Stabilization - Still Issues

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Nozzle

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Straight above heater element

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Thermistor inside insulation

Hopper

  1. Do it in 2-3 phases
    1. Start at 180 and stabilize
    2. Second phase at 200
    3. Third phase at 220
    4. ​

Band Heater

Band Heater

Band Heater

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Heat Stabilization

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Nozzle

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Straight above heater element

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Thermistor inside insulation

Hopper

  • 3 thermistors and heaters?
    • Issue - uneven distribution of temperature
  • Use aluminum foil
    • Fiberglass insulation tubes - they start to burn
  • Use rock wool
  • 2 heater should work well - that’s first point of attach
    • Try multiple ones later
  • Use 260+ C

Band Heater

Band Heater

Band Heater

3 of 9

Electronic Controls

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Hopper

  1. VSCodium with PlatformIO as IDE
  2. Git repo
  3. U8g2 - library for rendering to LCD 12864
  4. Aseprite - sprite editor
  5. Rotary encoder input on ST7920 controller (need help understanding pin diagram to code input controls)

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Heat Stabilization

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Nozzle

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Fill in with aluminum foil

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Thermistor inside alumium foil but above band heater

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Thermistor inside insulation

Hopper

  • Add end plug
  • Pay attention to location of heater element vs sensor
  • Start with 1 heater element at a time
  • Vary the power to the heater
    • 200W
    • Pay attention to ability to run these via PWM
  • Add insulation
  • Material - switch to TPU, a known material
  • Move heater directly above nozzle

Heater barrel

Motor

Band Heater

Band Heater

5 of 9

Test Procedures - Varying Extruder Push

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Hopper

  • Vary auger speed -
    • external speed controller
    • Variable power supply
    • 24/12v power
  • Vary auger speed - though Universal Controller on/off
    • Yes, D8-D10 can handle up to around 3A safely
    • Yes, with a SSR DC-DC relay - can switch 120 hz
  • Use a throttle screw
    • Block off the nozzle aperture
  • Move the auger up and away from nozzle to reduce push
  • Some control on auger feed rate from hopper
  • Temperature control
  • Use a different auger - 1” but slightly thinner
  • Shave flutes off auger
  • Use ½” auger

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There are notions of pulsed vs continuous operation - for both motor and heaters

Heater barrel

Motor

Band Heater

6 of 9

Reprap Thermistor

Top heating element and reprap thermistor (now at the bottom)

Middle heating element and Inkbird thermistor

Bottom heating element

Bottom heating element

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OSE Filament Extruder

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g

Hopper

Heater barrel

Band Heater

Motor

Band Heater

Band Heater

Band Heater

Coupler

Nozzle

Fans

8 of 9

OSE Filament Extruder Photo Album

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  1. Insulate with rock wool + aluminum foiland lower from 900F
  2. Attain reliable temperature control
  3. Place thermistor by the nozzle, which is the critical temperature

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Hopper

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OSE Filament Extruder

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About 16 kg force exerted

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24v dc

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120v ac

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About 170 kg force exerted - can break bit if ran cold

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https://www.phidgets.com/?&prodid=314