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?

2 Likes
3

Dried in my oven for days @ 60C

2 Likes
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.

3 Likes
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.

2 Likes
10

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

11

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.