3devo_extruder:3devo_extruder

3devo Extruder

±0,1mm deviation is in spec (± means both + and -)

Bad: < 2.75mm
In spec: 2.75mm
In spec: 2.85mm
In spec: 2.95mm
Bad: < 2.95mm

  • let hopper run enpty for approximately 15 - 20 sec
  • add little batches of material each time
  • when the extrusion is pure, add more of the material

PLA, HDPE & DevoClean-mid-temp can stay in extruder after shutting down. All other materials need to be flushed out (with purge material, PLA or HDPE)

  • 4-6 hours @70-80°C.
  • Other sources say to stay below 40°C
  • When the filament is too brittle
  • Boil water in a large pot.
  • Place a test piece of filament into the boiling water with tongs for 6 seconds.
  • Allow the filament to dry completely (we recommend at least 24 hours). Do not dry the filament in direct sunlight.
  • Test the re-hydrated filament with your 3D printer.
    • If filament sizzles when printing, we recommend re-running the process, but only re-hydrate the filament for 2-3 seconds
    • If the filament is still too brittle, run the process but re-hydrate for 10-12 seconds.
  • Submerge the entire spool in boiling water for the same amount of time which worked for the test piece.
  • Allow the spool to dry for at least 24 hours.
  • Your filament roll is now hydrated and ready to use again.

Info summarised from here

Extrusion width is difficult to control. It depends on many factors and there's no simple setting to make it work. This is a simple methodology to get you started.

  • Enter dimensions of spool into the settings panel
  • Make a stable environment
    • no wind or temperature fluctuations
  • Set initial parameters
    • All heaters: 10% above the melting temperature (see datasheet of the material)
    • Extruder speed: 5rpm. This is a good starting value. Common values are between 3.5 and 6rpm.
    • Fan: 50%. Changes to the cooling have a big impact on the filament.
  • Apply the settings
  • Start logging with DevoVision
  • Start extrusion.
    • Check for unmelted particles (too cold)
    • If filament is too viscous, lower the temperature
    • If there are bubbles, the filament needs drying
  • Set all heaters to the same temperature. Find out ideal temperature iteratively
    • Adjust the temperature in 10 to 30°C steps. Wait 10 minutes for the change to take effect. Patience is key.
      • for example: 200°C: too runny –> 170°C: a bit too solid –> 180°C sweet spot
    • Check the logs
  • When sweet spot is found, set up the temperature profile
    • Increasing shape: All heaters heat up to increasing temperatures. This causes more compression in the screw due to material being more solid at the beginning.
    • Bell shape: the first 3 heaters increase the temperature. The last heater has a lower temperature.
    • It's yet unclear to me how to determine a profile, or why it's necessary instead of using all heaters at the same temperature.
  • If you are dealing with filament deviation, the first temperatures to experiment with are the temperatures of heater 1 and 4. Also make sure that the material will be fully melted when entering the metering zone of the extruder.
  • check if your granulate is pure. Contaminants (a pellet of a different polymer for example) might partially block the flow.
  • Purge the machine with DevoClean might make the extrusion more consistent.
  • Feed material regularly. Avoid big changes in hopper loading.

Cooling:

  • too much cooling makes the filament too rigid. This makes it impossible to control the diameter

Extruder RPM:

  • output rate of the material
  • If the extruder speed is inconsistent, so will the material output rate. It will be very difficult for the puller mechanism to maintain a consistent filament thickness when the extrusion rate is inconsistent.
  • Extruder speed inconsistency can be caused by different things:
    • Wrong temperature profile;
    • Material feeding issues;
    • Material contamination;
    • Polymer degradation
  • Reducing the Extruder speed gives the puller mechanism more time to react, which results in more stable extrusion

Winder mechanism:

  • needs to be easily stoppable with 1 finger (adjust slip clutch on the back). If it pulls too hard, it overrides the control of the puller mechanism.

Source of info

  • keep waste plastic waste away from moisture, UV light, dust or grease
  • sort different polymers. Only work with 1 kind at a time
  • shred
  • dry (if the polymer is hygroscopic)
  • extrude
  • print

Source:

  • 3devo_extruder/3devo_extruder.txt
  • Last modified: 2020/09/10 07:35
  • by formlab