this post was submitted on 17 Jan 2024
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Stuttering when printing PETG [SOLVED] (sopuli.xyz)
submitted 10 months ago* (last edited 9 months ago) by DreadPotato@sopuli.xyz to c/3dprinting@lemmy.world
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I tried printing with PETG yesterday, and I noticed that it intermittently stops moving during the print for a few seconds. It doesn't throw an error or anything, just stops and then after a few seconds resumes as if nothing happened. But this creates huge blobs where it stops. It only happens when printing PETG, not PLA. Could this be caused by a filament setting in my slicer? I'm using prusa slicer. I inspected the gcode and there are no stops, pauses or color changes etc. in it. The behaviour happens both when printing from octoprint and directly from SD card.

Edit: these random intermittent stops are 10-20 seconds long, causing massive blobs from oozing filament.

Edit 2: so it seems to not actually be a PETG specific issue, but rather a model size/speed issue. I can get it running without stops if I just reduce print speed. When I crank speed to 100% I start getting these weird 10-20 second long stops.

So I'm overloading the controller with a lot of gcode commands in rapid succession? I'm running at slightly lower than manufacturer default Max.

SOLVED: the gcode resolution was set too fine, I increased it from 0.0125mm to 0.5mm as described here and the stuttering disappeared.

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[–] DreadPotato@sopuli.xyz 2 points 9 months ago* (last edited 9 months ago) (1 children)

I did some more testing, also with different slicers, and it seems to not actually be a PETG specific issue, but rather a model/speed issue. I can get it running without stops if I just reduce print speed. When I set speed to 100% I start getting these weird 10-20 second long stops.

So now in thinking it's the controller locking up because it's overloaded by too many small movmeent gcode commands in rapid succession?

[–] thegreekgeek@midwest.social 2 points 9 months ago (2 children)

Yeah I had an issue with this trying to print some ornaments in vase mode. I adjusted the cura profile as detailed HERE and it seemed to take care of it.

[–] DreadPotato@sopuli.xyz 1 points 9 months ago

That solved it, printing with PETG was just a strange coincidence then, but I've never seen this before.

[–] DreadPotato@sopuli.xyz 1 points 9 months ago

Yeah maybe that's what's causing my issue, although it's a bit more extreme in my case than his. I'll definitely give that a try.