Printing PETG-HF Problems

Bambu Lab X1 Series Bambu Lab X1C
1

Hi All,

I’ve been printing PETG-HF for a while and it’s been OK.

My X1C has now started doing this…

Purple_PETGHF
Purple_PETGHF1920×2560 746 KB

The first layer is fine but the 2nd layer doesn’t adhere to the first layer so the result is as you see here.

The filament is essentially Generic but the settings are very similar to Bambu PETG-HF.

Also, the same file prints 100% on my A1.

Any thoughts? It’s driving me crazy.

2

First question as always… is it dry? Second question, are you sure?

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3

Dried in my oven for days @ 60C

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5

I noticed someone else here has/had similar issues after a firmware update. I suspect I could be in the same boat.

I haven’t investigated the firmware issue any further yet.

Apart from that, I also looked at my suppliers filament settings. He has the Ramming Volumetric Speed set to something other than -1.I altered mine to -1 (as per Generic PETG) and it seems to print OK …currently

6

Did you recently update Bambu Studio? If so go back to the previous one and it will work just fine.

7

PETG is a fickle beast. It sticks well to 2 things, itself and the nozzle. 90% of failures can be resolved by adding ‘G29.1 Z0.03’ to the end of your machine start code.
Because of it’s inherent stickiness, it has to be laid/plopped down, it cannot be smeared like other filaments. It also cannot be low enough to pick up ANY wisps of previous layers, otherwise it just gathers around the nozzle leading to a failure-blob.
You should find this useful as well.

8

I’ve seen you post this z offset recommendation before and I have to point out: most of us are having zero trouble printing PETG without adjusting our gcode. Bambu sells a lot of PETG and the stock profiles usually work just fine without tweaking your machine’s calibration.

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9

Do an extrude in mid air and see if it curls to one side. If it does, swap nozzle hotend or clear it using cleaning filament. You may have a partial clog.

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10

Same thing just started happening to me. Same exact thing…

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I also can’t do a cold pull. The 170 degree warning won’t go away and there is no way around it. It won’t let you cool to 100C and then back the filament out.

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It just means you haven’t printed enough petg or large enough petg objects :smiley:

In my lifetime of 12-15 years of 3d printing I’ve probably gone through 40-50 rolls of petg, not for selling items but things I built from scratch and have meticulous standards because it will be MY design. And you’re right, most people don’t use it. But I would wager most of the time when you’re done printing petg, you have a tiny blob building on your nozzle. Any time you have a blob on the end of your nozzle after a print, you need to go see a doctor.

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13

I mean… I’ve completely filled the bed with PETG countless times, but sure, go ahead and tell me what I do with my printer. I literally print probably two rolls of PETG to one of everything else put together.

For what it’s worth, I do agree with you that the stock wiper is a bit lacking, especially with PETG and I do use a different design. I just don’t buy your z-offset idea.

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14

had the same things happen, but this have helped me alot

Cold Pull G-code

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I’ve completely filled the bed with PETG countless times, but sure, go ahead and tell me what I do with my printer.
:stuck_out_tongue:

I was trying to help someone but sure, go ahead and critique me because I’m sure yours is the only true and correct 3d printer. Apologies for the offense I was only looking to make you proud.

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In point of fact, I was trying to help by keeping them from chasing after wild geese. You insist:

That’s a pretty bold and broad statement that you’ve made several times without any real evidence to back it up. I thought I was pretty diplomatic in pointing it out, but you responded by implying that I just haven’t printed enough to know any different. I’m sorry you can’t handle a difference of opinion without getting snippy about it, but go off I guess… :roll_eyes:

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That’s a pretty bold and broad statement that you’ve made several times without any real evidence to back it up. I thought I was pretty diplomatic in pointing it out, but you responded by implying that I just haven’t printed enough to know any different. I’m sorry you can’t handle a difference of opinion without getting snippy about it, but go off I guess… :roll_eyes:

1 Like