BMG extruder under extrusion

Symptom

Click sounds from the extruder.

Solution

  • The driving gear on the stepper shaft and the plastic gear are meshed too tightly. Loosen the bolts that attach the extruder and adjust i

  • Driving current is not high enough. With TMC drivers 800mA is high enough for most conditions.

Symptom

Unpredictable under-extrusion after about 10~20 minutes or some layers of print.

Solution

  • Heat creep happened before and melted filament residuals clogged inside the heat break. Clean the heat break with a nozzle needle at printing temperature, or replace the heat break.

  • Retract too much and the softened & deformed filament clogs at the junction of heatbreak and nozzle. It depends on your filament, but for the BMG + Volcano combination, the slicer retraction settings of 0.4~0.8mm @ 40mm/s for PLA would be enough. Remember to check other retractions in pause.g, resume.g and in the end script of slicer.

  • The 3010 fan attached to the heat sink is not powerful enough. Use a fan with higher CFM.