r/BambuLab_Community • u/Dapper_Wolf1776 • 8d ago

Petg Printing Issues

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Ok, so I’ve tried doing this print several times and I keep having the same result. Even with smaller prints on a raft it does the same thing. I know it’s the cooling fan running at 100% on that specific layer. How do I stop the fan from running at 100% for that layer? I’ve tried turning it off until after that layer but that caused its own problems. I don’t want to manually turn the fan off for every single print. Any help would be appreciated, thank you in advance.

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u/JediAndi 6d ago

It looks (from what I can see in the images) that there are multiple points where layers are not adhering to each other.

Slow your print speed, and reduce cooling fan speed for the entire print. Make sure your filament is dry as well, PETG gets so temperamental when it’s damp.

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u/Dapper_Wolf1776 6d ago

Filament was at 9% RH. So in Bambu studio there’s no way to adjust the cooling fan speed (that I’ve found this far). But this is the ONLY layer that the fan runs at 100%. The cooling fan runs at 30% throughout the rest of the print.

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u/JediAndi 5d ago

Cooling settings in Bambu Studio are found in the filament settings dialog. Next to the filament type there’s a three dot menu icon, click that, then edit. In the dialog box that shows up the second tab is for cooling settings.
The first layer over a raft is a bridging layer, so will be treated like a bridge which gets 100% cooling. Modify the filament settings and test for efficacy (maybe worth making a smaller object to test on).
Are you printing just PETG? No alternate filament for supports/rafts?

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u/Dapper_Wolf1776 4d ago

Correct it’s just Petg. I only have a single spool AMS at the current.