Example of stringy under extruded 3D print

Do you want o know how to fix an under extruding 3D print? When your print is looking stringy like it’s not filling all the way it could be a few things. The joys of 3D printing are it could always be something else. The main two reasons for a print to turn out this way is your print temperature is too low or your printer is under extruding. In this blog post, I will tackle the cold pull method to clear out your nozzle. Hopefully, this will quickly solve your issue and your quality printing can resume. To save you time please try to up the temperature of the nozzle by 5-10 degrees. If that doesn’t fix the issue move on to the method explained below. Since we are pulling out the old filament debris it is best to use the cleaning filament or a different color nylon filament so that you can verify the debris is out.  I do all my printing on one Ender 3 V2 and two Aquilas.

Step 1:

  1. Have a different color from the last filament used ready. Nylon filament or a cleaning filament
  2. Remove the old PLA.
  3. Remove the tube from the extruder. I use sandpaper to help grip the tube
  4. Heat the nozzle to 250C
  5. Insert the cleaning filament through the nozzle until you see it coming out the end
  6. Set your printer to cool down or nozzle temp to 0. While it cools, apply constant pressure on the filament.
  7. Watch the temperature on the user interface.
  8. When the temperature of the nozzle reaches 90 °C pull the filament out quick and hard
  9. Cut the end off and repeat steps 4-8 until you see until the you see no remaining different color filament from your cleaning filament and the filament through the nozzle is not curling up on the sides.

I hope that helped fix your under extruding 3D print. Happy Printing!

Example of stringy under extruded 3D print
Example of stringy under extruded 3D print