#Bums and Blobs on the printed surface?

1 messages · Page 1 of 1 (latest)

wooden glacier
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On my most recent prints, I have something like bumps/blobs and they are super ugly. I already made bed leveling before the print and tried out different print speeds and temps. This seems to not change the output. I also tried out different filaments, which had the same blobs aswell. Anyone knows whats causing the issue?
I have a Neptune 3 Pro and used the standard .4 nozzle

photo_2023-08-10_10-44-36.jpg
ruby pastureBOT
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AI Help

The bumps/blobs on your prints could be caused by a few different factors. Here are some possible causes and solutions:

  1. Overextrusion: Check your printer's extrusion settings. If the filament is being extruded too much, it can cause blobs. Try reducing the flow rate or adjusting the extruder steps per mm.

  2. Retraction settings: Improper retraction can also cause blobs. Ensure that your retraction settings are optimized by adjusting the retraction distance and speed. Experiment with different values to find the optimal settings for your printer.

  3. Z wobble: Check if there is any vertical movement (z-wobble) during the print. This can cause inconsistent layer heights, resulting in blobs. Make sure your Z-axis is properly aligned and tighten any loose screws or belts.

  4. Print acceleration and jerk settings: High acceleration and jerk settings can lead to excess vibrations that result in blobs. Try reducing the acceleration and jerk values in your printer's firmware.

  5. Cooli...

WARNING: This response is AI generated and may contain errors.
keen basin
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check in your slicer where the z changes are being placed

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if it coincides then its possibly the retraction on layer change being set wrong

wooden glacier
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I am fairly new to 3d Printing, so not sure how to interprete your answer.
I guess you mean where the print head is changing height to start printing the next layer, right? I am aware that on those spot bumps can occure. However, it seems to be all over the the surface. also multiple times on the same layer

unkempt sundial
wooden glacier
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I am using a rpi and octoprint, so not using the sd card of the printer itself

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not sure if its enabled automatically by octoprint

elfin abyss
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Wouldn't make sense for streamed prints, since the streamer is what needs to support resuming then

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This could also be wet filament

wooden glacier
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I will put it in a dryer and see if that affect the printing quallity at all. Also I will try to keep the rpi a bit cooler, because I just saw that its a bit too hot, which might also affect the printing quality. I will come back to you if i have tried out both approaches.

rich scroll
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you print via sd card i’m assuming?

wooden glacier
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No i am not. I am using octoprint and stream via usb

analog nexus
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is it only on this model?

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There is a chance that your model has to many faces and Marlin can't handle so many Gcodes that are needed for high poly models. In such case Marlin will stop printing for a tiny moment causing the nozzle to leak creating blobs like yours. Try to lower your faces in blender or any other software.

ruby pastureBOT
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wooden glacier
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yes, thats also what I read somewhere else. As written above, I had some overheating issues with my pi, which might cause those small lags. I moved the pi to somewhere where it might be a bit colder and repeat the same print. Will report if that solved my issue

ruby pastureBOT
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wooden glacier
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I improved the cooling of the rpi and now the surface is nearly smooth. So it was indeed the rpi that was too hot, probably was throtteled and caused this issue