this post was submitted on 23 May 2026
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(UPDATE: a different issue??) What are these burn marks on my failed 3D print? (sopuli.xyz)
submitted 12 hours ago* (last edited 3 hours ago) by sbeak@sopuli.xyz to c/3dprinting@lemmy.world
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original post:

I am trying to 3D print a Hollow Knight channeled nail, but when the handle was nearly done printing, the whole thing fell over and I had to cancel the print. There are these burn marks and such on the print, what does that mean?

Do I need to make the model smaller, or is there something wrong with the print settings?

https://www.printables.com/model/19648-channelled-nail-from-hollow-knight (model I am trying to print)

edit: I am now trying to print a different, smaller model to test. I have cleaned my nozzle with some steel wool I had, and I also scrubbed my build plate, and now my printer is running into a different issue. The filament is stringy and doesn't stick well for some reason. ~~This only occurs with white filament, the orange printed fine for a small print. Is my white filament too wet?~~

I tried it a second time, same result (ended the print earlier):

It seems like the first player does not stick to the build plate...

edit 2: nope, printing the same model using orange PLA instead of white nets the same thing.

What am I doing wrong???

edit 3: Wait a minute, I just realised that OrcaSlicer was set to Smooth High Temp Plate instead of Textured PEI Plate. Whoops! I will change that now and see if that fixes anything. That is probably why filament is not adhering to the plate, but it does not explain the weird burn mark of my initial failed print.

edit 4: Nope, that still doesn't fix the issue where the filament doesn't want to behave. :(

Could the filament be too wet? Or is there something else wrong, could the printer settings be configured incorrectly?

Insanity is when you try doing the same thing twice and expecting a different result.

edit 5: My printer is able to print a standard Benchy with no problems, so there could be something wrong with the models I want to print and/or I have the print settings for my models done incorrectly? Very strange. Or maybe it's just an issue for relatively large models, IDK. I will look at my print settings to check what could be going wrong...

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[–] myplacedk@lemmy.world 1 points 4 hours ago (1 children)

but it does not explain the weird burn mark of my initial failed print.

I guessing that when it was falling over, part it got taller. (Think of a 199 cm tall cabinet in a 200 cm room. It can't fall over, it will hit the ceiling.)

As it got taller, the nozzle could dig in.

As the nozzle got embedded in the plastic, the heat would melt some plastic, and the dirt would stock to the warm molten sticky platic.

[–] sbeak@sopuli.xyz 1 points 3 hours ago

Ohh, that makes sense. I think that's probably it. Next time, I will scale down my prints as to not reach the height limit.

But I am still running into the issue where filament isn't correctly adhering to the build surface!

[–] DoubleDongle@lemmy.world 5 points 11 hours ago (1 children)

I get those when I print PETG too cold. Filament fails to stick to the print and cooks on the nozzle for a while, then gets wiped off eventually.

[–] UnrepentantAlgebra@lemmy.world 1 points 10 hours ago (1 children)

Wait I thought that was from when the PETG gets too hot and oozes out onto the nozzle?

[–] DoubleDongle@lemmy.world 1 points 3 hours ago

I think that's also possible, but it's happened to me a lot more from lower temperatures.

[–] LurkingLuddite@piefed.social 4 points 11 hours ago* (last edited 11 hours ago) (1 children)

In addition to what others have said, this is definitely a failure of temperature control. Only some filaments will do more than turn liquid at temperatures that your print head should be seeing. (eg: PLA with hours of heat exposure)

If you never clean your print head (I always wire brush a nozzle before each print), it could just be buildup. Otherwise, I would take some time to check on what your printer thinks of a given temperature.

I've had to replace thermistors twice in the last 12+ years on my oldest printer (TAZ 6). Usually, it fails by being too cold and clogging. Though it has several times gotten too hot and produced similar results when it was going out or otherwise not thermally coupled well enough to the heating block. Rarely, it can be a connection issue between the controller and the thermistor.

Don't be shocked if you have a few things to check and lock down before you solve the problem.

[–] sbeak@sopuli.xyz 0 points 7 hours ago (1 children)

I don't often clean my nozzle, and I can see brown stuff on it. Is this normal wear and tear, or do I need to clean it?

[–] LurkingLuddite@piefed.social 1 points 7 hours ago (1 children)

Yes.

[–] sbeak@sopuli.xyz 0 points 7 hours ago (1 children)

yes to clean it or yes it is normal?

[–] myplacedk@lemmy.world 3 points 6 hours ago (1 children)

Yes to both.

[–] sbeak@sopuli.xyz 1 points 5 hours ago

OK I have tried cleaning the nozzle with some steel wool I had, and that helped to remove a bit of it, but not all of it.

[–] Aarrodri@lemmy.world 3 points 12 hours ago (1 children)

I have been printing more than a decade and have not seen this. But I suspect a clog? Then the filament burns inside and eventually comes out all chared? Or temperature control issues where you nozzle gets way too hot for short times? Just guessing here

[–] sbeak@sopuli.xyz 2 points 7 hours ago* (last edited 7 hours ago)

thank you AI! I will try to clean the nozzle of my printer and see if that fixes anything.

I do not see any "leaking filament", so that probably isn't the issue.

[–] tal@lemmy.today 1 points 12 hours ago (1 children)

the whole thing fell over...Do I need to make the model smaller, or is there something wrong with the print settings?

I haven't done 3D printing for some time, despite following the community, but can you add a base, perhaps, that would make it more stable and is only attached at a few points and can be snipped off? There's probably terminology for such a thing, but I'm afraid if there is, I don't know it.

[–] cecilkorik@lemmy.ca 1 points 12 hours ago

It's typically called a raft or a brim depending on whether it's underneath the whole print or just around the edges.