About a dozen layers into printing this gridfinity box with petg, the print fails on the outer-perimeter overhangs. The inner parts of the model seem to print fine.
Are there any settings that I should be exploring?
Printing Overture PETG with a slightly modified Generic PETG profile (see below for Filament and Cooling settings).
You didn’t state that you dried your filament. Try that first but before you do, it’s important to weigh the filament before and after drying to ensure that moisture was removed and how much. Otherwise you’ll be guess at the root cause.
Alternatively, try cutting the model into one smaller section and start testing different temperature settings. This has been discussed in this post on PETG.
This kind of stringing is an indication of incorrect temperatures. That can be cause by the following:
The other diagnostic step that you may try is to rotate the model on the bed to see if there problem moves. If it is, then that could be an indication of uneven airflow over the part possibly by an open door or maybe air conditioning blowing on the chamber.
Thanks so much, @Olias, for your great suggestions.
I ruled out issues with the hotend/thermister for now, since I just did some maintenance on that a few days ago.
I believe that the problem was moist filament — I placed the spool in the dryer for 6 hours and the print, now in progress, seems to be holding up well. Clearly, I need to work on managing moisture in my petg spools.
Thanks for closing the loop and sharing with the community. You’re not alone. If you do a search here on the term PETG, there have been a huge number of posts started on this topic. In particular, Bambu PETG-HF. So if there is comfort in knowing that you have a lot of company… well… there it is.
I believe this may be happening due to high humidity in the Northern Hemisphere or a recent change in Bambu’s PETG-HF formula or supplies, with quality control not yet in place. The number of complaints suggests it’s not a coincidence.
