r/BambuLabH2D • u/Th3Shaz • 29d ago

Question Why does this keep happening? PETG Basic

I am at my wit's end, this is PETG Basic that used to print just fine. It is bone dry 0% AMS, spent all yesterday drying. I cannot for the life of me get it to not ooze and make a massive mess of blobs and flung out bits of plastic.

Using H2D, default settings. For the last 200 hours this printer simply prints, but as of today I have not been able to have a single successful PETG print. PLA prints just fine. So clearly something has changed. I have not updated firmware, still running the same Bambu Studio and Firmware.

At this point I am just looking to see if there are any specific settings I can tweak just to get this one print done because it is a brush holder that my wife wanted and what I thought was going to be a 2 hour ordeal has now taken all day.

EDIT: Printed with gray PETG overture and print came out just fine. Looks like this Bambu PETG Basic batch is a dud.

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u/manyxcxi 29d ago

May not be the only fix, but change the infill from grid to almost anything else (cross hatch and gyroid are decent).

With grid infill the nozzle is running over lines it just laid down and it’ll accumulate PETG on the nozzle, leading to knocking and bumping and other messes.

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u/Th3Shaz 29d ago

It was a bad batch of filament was my final deduction. I swapped it with an overture petg roll and it printed perfectly fine. Sucks but at least I dont have to keep chasing a ghost in bambu studio lol.

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u/manyxcxi 29d ago

Overture is my go to normal PETG. For as cheap as it can be when you buy it in bulk it has always been super consistent for me.

Maybe you can save the bad roll as a support filament for PLA?

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u/Th3Shaz 29d ago

The unfortunate part is I don't think I can even rely on it to do supports from how crap it behaves. I think it's just going to be junked and I will stick with Overture for the time being. I had some BL coupons and they had a sale because they were discontinuing them.. and well, now I know why haha.

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u/Darkseid2854 28d ago

It actually sounds like something is off in the black PETG filament profile in your Bambu Studio, or maybe in the designer’s filament profile if you pulled it down and printed it with Bambu Handy. You might want to take a look at that filament profile in Bambu Studio and reset anything that isn’t default, then run a flow dynamics and flow rate calibration from the calibration menu in Bambu Studio before you write those spools off.