I’ve been having some issues these last few days printed some caps for fence posts that need to be printed in petg. I was able to get about 20 of these parts printed with little to no defects on the parts.
Last week I started getting zits all over my parts and I have played with a bunch of settings but haven’t gotten much better results.
I’ve done everything from playing with retraction, flow rate, nozzle temps, and print speed. I am trying to get these to print with a matte finish but for now I just need them to print with no defects.
Is your seam (Under quality tab) set to random? The sporadic placement makes me think these are the seam marks set to random.
Definitely check the seam settings. The other major thing with PETG is water absorption in the filament, do you have a filament drier? I used to get defects like this until I started throwing the filament in the drier for 5-6hours before printing.
I tried drying the filament and didn’t get any better results. The seam is aligned in my preview so it should not be the seam.
I’ve gotten the best results by raising my retraction distance to 1.6mm, retraction speed up to 45mm/s and a new flow rate of 0.820.
I’m still getting zits on this part but they have gotten much better
This looks like over extrusion because of fluctuations in filament size or a misalignment in the extruder gears, grab some calipers and make sure its variance is not more than .03, and that K value needs to be rechecked, I’ve never seen anything above a .27 not even the limpest TPU in the world. Maybe you moved a decimal space but my brain is like thats way way off/wrong.
What kind of PETG filament are you using? eSun PETG is prone to doing this. I have had better results with BBL PETG.
You said you dried it. Can you be specific about how you did this? Not all drying methods are equally as effective.
If things were fine before and you didn’t explicitly change anything, then one other possibility is a partially clogged nozzle or debris stuck to the nozzle. PETG loves to stick to the nozzle. Try a PLA cold pull or running some cleaning filament through the extruder.
You also seem to have some resonance lines in your print. I would also run the recalibration procedure.
