Elegoo Rapid PETG used to print like PLA with 0.6 nozzle after I tuned it, but something has changed and now it prints like ■■■■. So I bought some Bambu PETG-HF, the result is much better with a bit of stringing and tiny bubbles. The major issue is that it seems to be under extruding near the seams, resulting in large gaps. Exact same print with Elegoo does not produce gaps.
The filaments were dried in dedicated filament dyers for 8-12 hours prior printing and also during the printing too which still can’t get rid of stringing and tiny bubbles.
Any idea what is going on here? These are printed on P1S using Bambu PETG-HF profile. Interestingly, printing small parts with the exact settings seems to be less affected.
I calibrated it with both flow and k-value, and it improves the result but doesn’t completely eliminating the gaps. But it made the overall print worse than default BBL filament profile.
I think 0.6 nozzle and large parts are factors here. Same filament prints small parts just fine with 0.4 nozzle. With large part with a print time over two hours and 0.6 nozzle, there are gaps at the seam, small bubbles and occasionally tumors from goo buildup at the tip of nozzle.
No issues printing ABS & ASA of the same large part with 0.6 nozzle.
I’ve confirmed the culprit is the printer profiles. Bambu Lab almost perfected 0.4 printer profiles, but any other nozzle size are roughly tuned for PLA. Long story short, it has to do with tuning printer profile’s retraction, temperature and speed parameters for each filament type. Confirmed! 0.6 and 0.8 printer profiles suck!
