Basic Information:
Printer Model: Custom i3 style
MCU / Printerboard: BTT SKR 1.4
Host / SBC: Acer N281G mini-desktop
printer.log (1.3 MB), heattest.txt (22.0 KB)
Describe your issue:
I’ve recently started having under-extrusion issues on one of my printers and I can’t seem to find a fix. It’s an old extruder from an Anet A8 clone, but it worked just fine until now.
Solid infill @ 45 degrees
Solid infill @ 0 degrees
And this is a photo of a few weeks old print from the same printer, it didn’t have the under-extrusion issues:
I’ve tried everything I could think of
- tuned rotation_distance - it extrudes in 50mm when asked to do so and it’s 98.22% of the value based on physical measurements, at 100% it under extrudes about 2mm of filament when asked for 50mm.
- verified the extruder. The gear looks brand new, the pulley seems good.
- changed the heat break to an all-metal one, then back to one with a PTFE tube
- ran PID_CALIBRATE a bajillion times for all the different changes I’ve made.
- added a MOSFET and tried it on an extra power supply, tried 2 different extra power supplies, just for the hotend, a 12V one and a 24V one (in the logs you see the 24V one with a 0.6
max_power
, but I’ve tested most prints at the default value) - reverted all slicer settings to the built-in values as provided by PrusaSlicer.
- reduced the printer speed, increased it.
- I’ve tested 3 different brands of filament (they worked fine in the past).
- changed the extruder motor driver and cable – didn’t change the motor
- tried different temperatures, the temperature seems stable enough, even at 24V with 0.6 max_power.
- I even played with the belt tension and stepper current (1.5A) for both the extruder and the X&Y axes
- printed different shapes and at different sizes, but I couldn’t find a consistent pattern
Does anyone have any ideas on what else I should check?
Thank you!