PetG trouble  

RE: PetG trouble

Hi,

make sure the filament is dry. Otherwise it's futile. 

Then, check the "speed" view in Prusa slicer. The printer is coming from a slow section, then speeds up and something happens. The question is, why.

Check the filament path whether it moves freely or gets stuck in the PTFE tubes, then snaps loose.

You may be able to fix the symptoms by generally reducing print speed but of course that's just a hack not a solution.

I'd also do a cold pull, check the outside of the nozzle and the extruders (open idler, is there debris inside, is the wheel clean?)

RE: PetG trouble

Did retightening of the belt after adjusting it using the Vernier Skew Testing tool downloaded at printables a few days ago. Since Skew calibration, print results where bad at best. Additionally I but the my PetG into my polydryer. 

First print with PLA looks promising, will start PetG tomorrow 

Do 

RE: PetG trouble

had similar problems. nozzle was loose and optimized x-y belt tension.

can you post your profiles? - my prusa-slicer does not have a "PETG" Printing Profile!?

uploaded my current print and filament settings and would like to hear feedback 😉

slowed down some infill speed settings (best settings from 0.2mm Structual profile)

https://github.com/josy1024/GCodePlayground/tree/main/PrusaSlicer

RE: PetG trouble

Now the PetG results are in.

Same model just changed from PRUSAment PLA to PRUSAment PET-G and troubles are obvious picture

Interestingly there is on line of layer shift and then forward the area of the seam is problematic and quite awfull to look at

Must confess I don't know what's the Problem 

Help would be needed

RE: PetG trouble

After some reslicing and other tempering I tried changing slicing profile from 0,2 balanced to structural and wow, result changed considerably 

RE:

Posted by: @docsascha

After some reslicing and other tempering I tried changing slicing profile from 0,2 balanced to structural and wow, result changed considerably 

 

That's a reduction in speed - fixes the symptoms (better than nothing) but it would be better to understand the root cause. Try a "speed" profile to provoke the failure mode, or crank up the dial on the printer to 300.

BTW, I think the best indicator is "actual volumetric flow rate" in the slicer. My bet is that problems will show in high-rate areas, when entering from slow sections.

RE: PetG trouble

Thank you for the answer, your right print time increases +70 minutes

I not quite understand how to "Try a "speed" profile to provoke the failure mode, or crank up the dial on the printer to 300."

Sascha

RE: PetG trouble

As I looked at the print using the structural setting, quality improved but still there are some serious issues with the result. 

RE: PetG trouble

Just Use my petg profile from github. Ive lowered some speeds values < 100.

https://github.com/josy1024/GCodePlayground/tree/main/PrusaSlicer

You Can also retry printing a "petg Temperature tower" , maybe increaseing temp +5 or +10 °C for Filament settings helps too.

(I sometimes change nozzle Temperature during printing to immediately see impact) 

Also tweak with cooling of filament settings. 

Eg: min 20% max 50%O

Maybe too much cooling in overhangs? 

(I do not See any typical petg stinging so I assume you Can Print with higher temp to improve)