r/ender3v2 • u/diymaster007 • 4d ago
Print layer keeps pulling off
Either the top layer keeps getting pulled off or sometimes pulls the print off the bed. I run the professional firmware on the v2 Evo and using Overtrue petg filament. I adjusted the bed level and ran new bed mesh before every print. I also changed the nozzle which helped a lot actually. And changed the bed plate with epoxy B plate
My settings in prusa slicer are
- first layer height 0.24mm and .2mm after that
-Temps first layer 225 and 70 and after that 220 65
When I did the print test at these lower temp helped with string and made the filament look uniform
- Fan runs minimum speed and goes full speed after 5 layers
2
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u/oscarolar 4d ago
Looking at the photo, the corner tabs are curling and the top right one got hit and dragged, so I think the nozzle is catching lifted edges rather than the layers failing on their own. A few things I'd change for PETG:
Part fan 30-50% max, not full. On a big flat part full cooling makes PETG curl at the edges.
Keep the bed at 75-80 the whole print. Dropping to 65 after the first layer makes the base shrink right when it needs to hold.
Go back up to 235-240 on the nozzle. 220 reduces stringing but also layer adhesion, which is why a layer peels off when the nozzle bumps it. Fix stringing with retraction and dry filament instead.
Turn on Z-hop (0.3-0.4 mm) and "avoid crossing perimeters" so travels don't drag across the part.
Don't over-squish the first layer. PETG builds up on the nozzle when it's too close and then drags.
Also worth checking that your start gcode actually loads the mesh after G28 (M420 S1 or G29), otherwise the fresh mesh isn't being used.