Issues with a CR10max - tons of stringing, damaged prints (if it ever finishes the print)

Hi !

I’m posting here because I can’t seem to get things right.

To resume the situation, I’m working in an association and we have a few printers who sometimes run into issues but 99% of the time we can resolve everything after some tries.

So what’s happening today is we have a creality CR-10 max. It always had a few issues, mainly just stringing on prints but it was ok.

Until recently when it became nightmarish. I don’t know what caused the recent changes. Maybe it got too cold at some moment ? Maybe it’s because it wasn’t used for like 1,5 months ?

I added the pictures to make things clearer.

So here’s all what happened :
We started with issues on the print. At first we tried to calibrate the bed, to ending up noticing it had became warped (the center is lower than the sides).

After some trial and error, I ended up with a very satisfying result… at least for a few layers because after it turned wrong.

We tried to clean the nozzle, we tried different retractation settings. I looked up and tried a retractation test model (you can see it on the pictures). It started ok but when I came back, as you can see a bit on the top it started to go spaghetti and print on air.

Anyway, you see here picture of the piece we have to make.

I don’t think retractation settings are the problem here. But no matter my research or time taken to try settings, I have zero lead to what could cause the issues here.

For information, at 120% speed it managed to string way less. But there’s still damage on the print.

If anyone has any idea to what could cause this (the damaged walls), I’ll be extremly thankful.

I wish you all an awesome day !





Well dried filament should go someway to curing the stringing, guess that is PLA also lowering the flowrate to 90% should help.

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This is PETG. The filament is here since about 2 weeks, we have other filament that is still good after months being outside. I’ll check if I can see anything about it though.

It’s not the first time I read about flowrate, I’ll look into that.

Thank you !

Hello Robin, That really does look like damp filament to me.

Cheers.

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Hi !

I’ll try with another filament. It seems unlikely to me that it is humidity because it was used just before on another printer and everything came out perfectly.

But I’ll try anyway.

Ran a print this afternoon, a roll that I used just last week, first couple of feet were stringy but anything that was then coming out of the drier was dry enough to stop stringing. Doesn’t take much moisture and it doesn’t take long to have an effect, but I am in a humid area so likely more prone to moisture.

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