Prusa Mini: wall delamination only in one quadrant of cylindrical prints – always same printer-side direction
Hi everyone,
I have a very strange issue with my Prusa Mini that I have not been able to solve so far.
The problem first appeared when printing a flat lid with a vertical tube/wall section on top. I then tested it with a simple cylinder/tube, and the issue is reproducible there as well.
The strange part:
Only one quadrant of the wall, roughly from 3 to 6 o’clock, delaminates or has almost no bonding between the lines/wall passes. The other three quarters of the same circular wall are fine. It is not general layer delamination across the whole print.
The affected quadrant is always in the same physical direction on the printer: roughly toward the Prusa Mini control panel. Moving the model around on the bed does not noticeably change which printer-side direction is affected. A calibration cube does not show any issues.
What I have already tried, with no change at all:
- PLA printed normally at 215 °C, then tested up to 250 °C in 5 °C steps
- Flow / extrusion multiplier increased up to 106%
- Changed infill/perimeter overlap
- Disabled part cooling fan
- Reprinted with PETG; the same issue appears
- Printed a simple cylinder/tube to rule out the original model; same problem
- Disassembled the whole moving arm / axis assembly
- Cleaned and re-tensioned the belts
- First layer looks good and is mechanically strong
- Flat/planar parts seem to bond normally in XY; the bottom layers do not split apart
- The slicer/model does not seem to be the cause, because the affected area stays in the same printer-side direction
The wall consists of 4 lines, but I would not expect that to cause only one quadrant of a round object to fail while the other three quadrants are solid.
I am out of ideas.
Has anyone seen something like this on a Prusa Mini before?
Printer Info
Prusa Mini
Material Anycubic basic Pla /Petg
Speed slow and fast
layer heigt 0,2mm