PETG printing issue using on my X1-C printer

[Gintonic]

Hello everyone,

I urgently need your help with a printing issue using Bambu Lab PETG Basic on my X1-C printer.

Hardware:
• Bambu Lab X1-C
• PEI print bed (first layer is perfect)
• Bambu PETG Basic

Object:
A box including a logo with dimensions of 160mm x 220mm x 60mm.

Print Profile:
0.20mm Standard @ BBL X1C

Issue Description:
Unfortunately, I am facing difficulties in achieving a successful print. The problems manifest as follows:
• The infill does not adhere correctly, resulting in numerous gaps.
• The wall layers are partially not connecting to each other.

Steps Taken So Far:
I have already tried several measures to address the problem, but unfortunately, without success:
• I left the printer enclosure door open.
• The nozzle has been cleaned, including a “cold pull.”
• I changed the infill pattern from grid to gyroid.
• The X1-C has been calibrated multiple times.
• I disabled the “slowing down for overhangs” option and increased the bridging speed to 200 mm/s.
• I dried the filament spool using the X1-C’s drying function overnight.

I only have experience with PLA so far, so I am currently a bit desperate. I am aware that PETG requires different printing settings than PLA. Nevertheless, it should be possible to achieve a successful print using the X1-C and the in-house filament, right? Or am I mistaken?

I would greatly appreciate it if you could help me troubleshoot this issue!

Thank you in advance for your assistance!

[silver118822]

Do youhave the video of that print that last photo looks strange.

[Gintonic]

I uploaded the video to yt for you

Print fail X1-C with PETG

[silver118822]

Have you tried printing a small object with the petg yet? Just wondering how it went. I havent printed with bambu labs petg myself, I use E-sun and it prints good. There has been a quite a few people complaining about bambu labs petg. Also from what I have seen they say th generic petg sertings work better than than the setting made for the bambu labs petg.

[dana.nelson]

I bought 8 different color spools of Bambu PETG and so far it has printed OK with the small parts I have done, but not as well as Sunlu which has been my go to brand. Like already mentioned, I would try using the generic petg profile which slows everything down and gives better results. No point in printing faster if it does not work…

[Gintonic]

I stumbled across the following post
[SOLVED] Bad quality when printing PETG

and have changed the settings to this effect

Now the print looks extremely good and I have only 1-2 imperfections! These come when material sets up or detaches and adheres again in another place and thus the subsequent layers then become unclean. Presumably, it is fundamentally difficult to realize a full-surface filling with a print of this size without something not running perfectly in one area.

I will still screw on the temperature and test the PETG material from Sunlu.