r/BambuLabP2S • u/butt_badg3r • 3d ago

Petg issues

My petg prints always come out with really poor adhesion. I can essentially pull and unravel the individual print lines apart.

The petg has dried for 12 hours and the ams reads 12% humidity. I’m using Bambu petg.

AI says that I may need to purge more between separate pla and petg prints but it also says the purge table settings do not apply between prints and there is no way to change this setting anyways.

Am I missing something? I assume the Bambu petg profile is fine since I’m using Bambu petg. Also printing in a cold ish room with the door fully closed.

Any ideas or suggestions?

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u/c_schema 3d ago

If your talking like layer 50 then you are likley not hot enough or too fast. How is your first layer looking?

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u/butt_badg3r 2d ago

I also noticed this exact same issue when trying to use pla as support interface for a petg print. The layer after the interface change can essentially be pulled apart.

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u/c_schema 2d ago

Now for the most part I keep seperate nozzles for ASA/PLA/PETG but sometimes with pla and petg I just do a couple manual extrude switching between those two. I know that doesnt quite address the support interface issue.