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…

  • Aarrodri@lemmy.worldEnglish
    41·
    11 hours ago

    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 …

    Edit: did some searching:

    Burn marks on 3D prints usually appear as black or brown specks, streaks, or burnt blobs. They are primarily caused by melted plastic accumulating on the outside of the nozzle, gaps in your hotend causing filament to leak and cook, or a printing temperature that is simply too high.1. Clean the Outside of Your NozzleOften, small amounts of plastic cling to the hotend during printing. Over time, this filament cooks, oxidizes, and drops off onto your print.How to fix: Heat up your hotend to your printing temperature and carefully scrub the exterior of the nozzle and heat block with a small, brass wire brush.

    1. Clean the Outside of Your NozzleOften, small amounts of plastic cling to the hotend during printing. Over time, this filament cooks, oxidizes, and drops off onto your print.How to fix: Heat up your hotend to your printing temperature and carefully scrub the exterior of the nozzle and heat block with a small, brass wire brush.

    2. Check for Hotend Leaks (Loose Nozzle)If melted plastic is seeping out from the threads above the nozzle, it will slowly burn and periodically drip into your model.How to fix: Heat the hotend to at least 250°C. Hold the heater block with an adjustable wrench, and use a socket wrench to tighten the nozzle firmly. The goal is to make sure the nozzle sits completely flush against the heatbreak (or the PTFE tube on non-all-metal hotends).

    3. Lower Your Printing Temperature

    4. Remove Internal OxidizationIf you’ve recently switched from a dark-colored filament to a light-colored one (like white), residual burnt plastic from the dark filament can linger inside and randomly appear.How to fix: Manually extrude 10-20 cm of the new light filament through the hotend at a slightly higher temperature to push out all the old, oxidized residue.

    • sbeak@sopuli.xyzOPEnglish
      2·
      6 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.