dim hearth
I understand this is largely a modeling issue, but given that I can not always expect a perfect model, is there a way to compensate for ultra thin walls? This print in particular was, I think, made for resin but I think even resin would have difficulties with walls this thin. The result is that Orca doesn't seem to think it can possibly print it, even when it's being told to do it anyways:
This is supposed to be a solid piece, but where you see the white spots is where it breaks it up erroneously. I am trying to see if it will just scale the line width up, which probably won't look that good but it's not super important to me that it looks bad, I just don't want there to be holes in the model.
I tried lowering these settings but at a certain point it just seems like no matter how crazy low you drop it, it will refuse to try and print these walls. Is this a mathematical thing, like the walls are literally infinitely thin?
Actually that screenshot is outdated, I also lowered the wall width down to something like 1% and it still showed the same tears in the model.
I also tried doubling the size of the print and the problem persists.
dim hearth
Compensating for thin walls [Unsolved]
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Hellow, I guess one easy way to do it would be to upscale the model slightly in both X/Y/Z axis.
Try with a very low upscale such as 101%, then keep going until you have a decent result.
Indeed as you said, it is more a modeling issue than a slicer one
dim hearth
So, I think it's obvious that the model from the OP was just unreasonable for a FDM printer to print. This is perhaps a worse example. The walls here are not absurdly thin in most cases but I keep seeing breakages where it doesn't even attempt to print smaller.
I've tried messing with these settings and it just won't close these gaps even if I try to convince it that it can reduce its wall width to below what would be possible. If I switch to Classic rather than Arachne, it actually does a better job with this. Is there something I am not understanding about these settings?
For scale.
This is a 300x300mm bed.
This wall which will not print even isn't that narrow.
(this is a .4mm nozzle fyi)
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Can you share the stl to compare ? If it is indeed a configuration error, I should be able to slice it properly
dim hearth
Can you share the stl to compare ? If it is indeed a configuration error, I shou...
I am not entirely sure if this would keep its dimensions (it should since I exported it after changing them). It should be 50mm wide and 80mm long.
So I did get this to print. The Wall Transitioning Theshold Angle was filtering out some walls until I increased it, I lowered the minimum feature sizes and wall lengths, and what finally allowed these smaller segments to print was changing the precision settings:
There are a few problems with this print but here is one of those thinner segments and it just looks odd. I've seen my printer print walls that are pretty unreasonably thin but this is perhaps the thinnest wall on the entire print at somewhere around .15mm, but the way Orca seems to be slicing it, I am not convinced it's a limitation with the printer because of how weird and consistently wrong it looks.
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I do have the same behavior on both Prusa/Bambu/Orca, so yeah, definitely model issue as the geometry is kinda weird. The worst thing is, even upscaling it, it just doesn't want to process this until a ridiculous % (even 150% won't do it).
Still, you can work around this slicing issue by adjusting the Outer wall line width. I've set it to 0.24 (random number tbh) from the original 0.48 and everything slice correctly (apart from the first layer for some reason, I guess some other option has priority over this one)
Though be aware the result might not be good, I'm not sure how the flowrate and feed will adapt to that as I've never tried that. It does change the used filament length and weight in the estimation, but I have no idea how well it's gonna print
dim hearth
I do have the same behavior on both Prusa/Bambu/Orca, so yeah, definitely model ...
How is this a model issue if you scaled it up all the way to 150% though? The walls on this model are consistent in width all the way up and the slicer almost seems to be choosing which walls it wants to print and which it doesn't even at certain layer heights. If it's willing to print a wall width at something stupid like .06mm and it encounters something that is .15mm+ thick, it stands to reason to me that it should have enough room to do it. It sounds more like maybe a limitation with Arachne or something.
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Well, I say model issue, but what I mean is more a "geometry" issue. When you look at the tool path, the wall that are sliced correctly are long loops, and it seems that the slicer is focusing on completing these loops. then it fill the gaps with small lines.
So yeah, it might print a straight .06mm straight line, but the .15 is in a tricky spot in between two loops and it seems to be unable to process it.
Arachne is doing is best but can't figure it out. Imo, it's really Arachne the problem here, because even with the classic wall generation, if you halved the Outer Wall width, it still slice properly.
dim hearth
Maybe that's what I need to do then for these tricky walls.
I am not sure what Orca considers to be "too small" either. I can set the line width as small as .3mm and any lower Orca will prevent me from setting it, yet I can go into these settings and set them at as low as 1% which is calculated over nozzle width. 1% of .4 is a lot smaller than .3mm lol. Feels like I am trying to trick Orca into slicing it the way I want at this point.
I'm going to try it again with these new settings + all line widths set to .3mm in the Line Width section to see if that gets me a better looking print.
Oh I also turned precise wall off after I printed that last one. I think the way it calculates how to separate outer and inner walls might throw it off a little.
I also think it's what's causing those gaps in my top infill.
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As long as you found a way to counter the limit, I guess it's fine lmao
Good luck with that print, it's one hell of a nightmare it seems :')
dim hearth
thanks