Inconsistent first layer

I have very weird behaviour on my first layer, which I can't seem to get right. What I have tried: - Get my frame square - Z height - EM tuning - Temp tower - different speeds - different extrusion widths - different filaments Its a VC3.1 400 with a Dragon HF and a Super PINDA. I am using @Helge Keck PAM, so I feel that the important part of the bed is being probed before the print. Attached are some images, the print startet on the bottom right corner. I would be very grateful if somebody could identify this problem for me...
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11 Replies
sherbs
sherbs•2y ago
Eliminate variables... Check probe for consistency, disable PAM... Use test squares to see if there is improvement
Helge Keck
Helge Keck•2y ago
make a complete mesh and show it
fargo
fargo•2y ago
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Helge Keck
Helge Keck•2y ago
this is actually a pretty flat bed this almost looks like extruder issues this repetive pattern points maybe to it but i am not entirely sure tbh
fargo
fargo•2y ago
Ok, thanks for the feedback, really appreciated! I will do some extrusion tests in that case...still have to figure out how exactly, that it would be meaningful. 😅
Helge Keck
Helge Keck•2y ago
do you print by chance PETG or PLA enclosed in this case?
fargo
fargo•2y ago
mainly ABS, then it's closed, for PETG I leave it open, otherwise I get clogging. No PLA.
sherbs
sherbs•2y ago
This may be gantry or bed flexing/moving a bit as things warm up... Although I wouldn't expect to see that happen so quickly over the course of the first layer... Is that bed mesh cold or hot? Maybe try a mesh at the same bed temp and extruder temp that you are printing at...
fargo
fargo•2y ago
OK, so it turns out it was the hotend which was partly obsrtucted due to sone residue from an earlier clog. It just wasnt noticeable at normal flows but around 22mm/3 I would get the result. After trying with a rapido and 0.6mm nozzle it looks near perfect.
fargo
fargo•2y ago
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fargo
fargo•2y ago
Thanks for your effort guys!!
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