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I'm currently facing a Z banding issue that frustrates me more and more.

My printer is a modified Anycubic I3 Mega.

Customizations:

  • Mainboard: Bigtreetech SKR 1.4 Turbo
  • Stepper Drivers: TMC 2208 v3
  • Hotend: E3D Titan Aero
  • Hotbed: 5 mm aluminum base plate with a 200 W 12 V silicon heat mat and 3 mm hard paper as print base
  • External MOSFETs for the hotbed and hotend each
  • Bigtreetech 3.5 inch TFT screen as display
  • BL Touch sensor
  • Marlin version 2.0.6.1

What I tried to fix this issue:

  • check leadscrews for debris
  • cleaned leadscrews and applied new grease
  • checked Z couplers and hand tightened all screws
  • checked tightness of the Y/X axis belts
  • increased the driver current
  • replaced the 12 V 25 A PSU with a 12 V 30 A PSU
  • Extruder steps re-calibration
  • PID auto tune for hotend and bed

Pictures of the XYZ calibration cubes I printed:

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Used slicer parameters (Prusa Slicer):

  • material: PETG
  • 240 °C / 100 °C hotend/bed
  • Infill 30 % with 60 mm/s
  • outer perimeter with 30 mm/s
  • 100 mm/s travel speed
  • 1 mm retraction with 40 mm/s retraction speed

The number of these horizontal lines and their occurrence is different on each print.

Any ideas?

Davo
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zero695
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1 Answers1

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So it looks like I finally resolved that issue. I compiled a complete new firmware based on the Marlin bugfix branch. Before I was working on the sources provided in the Bigtreetech GitHub. I started from scratch and put all the settings I needed into the Configuration.h and Configuration_adv.h. Now all rings are gone. Either there was really a bug or something or I messed up something in the firmware I used before and beginning from scratch solved it.

zero695
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