Random slower parts of the print | OrcaSlicer | Page 1

scarlet jewel Jun 29, 2025, 10:51 PM

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I'm having a print have random top surfaces be very slow, but only on one of my printers' profiles. What could be causing this? It happens on both the nightly build and on 2.3.0.

📎 FilterRing.3mf

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They all seem to be detected as top surfaces.

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speeds...

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the speed of those slow sections is precisely 90mm/s

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I set the top surface line width % from 93.75% to 100% and it still has somewhat slower sections? but not as slow? but this is still clearly some sort of undesirable behavior

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I also notice that some of the walls are also 90 mm/s

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I then tried using another one of my printers' profiles and now almost everything is 90 mm/s

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that's with a faster printer's settings but limited to 5k acceleration

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increase TRAVEL SPEED from 300 to 400mm/s and it's better???

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seriously?

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yeah I went back to the original klp1's profile

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going back to 93.75% top surface line width shows that that's solved

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but WHY does travel speed affect this?

void wagon Jun 29, 2025, 11:28 PM

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Here is something weird. If I set all of your speeds back to defaults, it tells me the top layer is printing at 350, even though that is not set anywhere and is not listed in the color legend. haha WTF? This is an odd one.

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scarlet jewel Jun 29, 2025, 11:31 PM

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yeah this is the weirdest bug I've ever come across

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it's making me think it's some sort of memory safety error

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just reading a random value from somewhere else

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@crimson fable btw the 93.75% top surface line width comes from the orcaslicer defaults for fdm printers https://github.com/SoftFever/OrcaSlicer/blob/3f7d5b85fd43043834f6c1f2035efc04cf0f2837/resources/profiles/Custom/process/fdm_process_common.json#L50

crimson fable Jun 29, 2025, 11:47 PM

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scarlet jewel <@885644033475629067> btw the 93.75% top surface line width comes from the orcas...

you live and learn never seen it before

scarlet jewel Jun 29, 2025, 11:49 PM

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crimson fable you live and learn never seen it before

if you've never done a generic printer before than sure

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if you base it on a voron or whatever then you'll probably have something else

crimson fable Jun 30, 2025, 12:01 AM

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void wagon

i thick that my be displaying the jerk speed , if you place the nozzel in the middle of the line what is the speed then

void wagon Jun 30, 2025, 12:24 AM

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crimson fable i thick that my be displaying the jerk speed , if you place the nozzel in the mi...

The jerk isn't 350 though. As a side note, for whatever reason, it doesn't let you position the preview nozzle in the middle of the line, it just jumps with each line of the G-code.

crimson fable Jun 30, 2025, 12:27 AM

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void wagon The jerk isn't 350 though. As a side note, for whatever reason, it doesn't let y...

i can get a similar issue with the speed reported too

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its because its traveling for what ever reason

void wagon Jun 30, 2025, 12:30 AM

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crimson fable its because its traveling for what ever reason

Oh! Is arc fittings turned on? Or spiral z-hop? I didn't think to check those.

crimson fable Jun 30, 2025, 12:35 AM

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no arc fitting , hop is auto

void wagon Jun 30, 2025, 12:45 AM

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crimson fable no arc fitting , hop is auto

That could be part of it. Auto z-hop uses arc travel moves in a lot of places.

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Wouldn't be the first time I have seen people having issues because of that setting. It should really have some sort of warning in the tooltip about it.

crimson fable Jun 30, 2025, 12:50 AM

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void wagon Wouldn't be the first time I have seen people having issues because of that sett...

let me force it to somthing

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trying all three options for z hop didnt change the speed issue

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its doing some travel for what ever reason, maybe its one of those undisclosed design features

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😁

void wagon Jun 30, 2025, 1:07 AM

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