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STL-Export: Missing certain faces

martin_kopplowmartin_kopplow Member Posts: 1,099 PRO
edited December 23 in General

Screenshot 2025-12-23 131529.png

Today I have a highly important and sophisticated thing to print:

https://cad.onshape.com/documents/5ee24d7ba5cfd589e38e4f7f/w/c8f599f8c7daa51b8b094397/e/a9b01df0ac8265e70d9bf7ef?renderMode=0&uiState=694a88dbd706c06a49251f32I

I do of course need a bunch of them, in different sizes.

Screenshot 2025-12-23 131612.png

When exporting to STL, however, the 'fingers' don't get exported, and what I see in my slicer (and also an STL viewer) is this. Needless to say it doesn't meet all expectations the target audience might have. Does anyone have an explanation? It appears it could have to do with the face blend used between the body and the hands.

Edit: Nope. If I replace the the face blend with a fillet, it still don't work. It might be the (seemingly simplest) flat hand surface that has issues with the triangulation. What am I not seeing here?

Comments

  • wayne_sauderwayne_sauder Member, csevp Posts: 631 PRO

    That is odd. It works fine for me. I'm on Mac and tried it with Bambu Studio.???

    Screenshot 2025-12-23 at 7.31.26 AM.png
  • Paul_ArdenPaul_Arden Member, Onshape Employees, Developers Posts: 226 image

    A Hattifattener! Great model, I’ve not seen any done as well as this.

  • martin_kopplowmartin_kopplow Member Posts: 1,099 PRO
    edited December 23

    Yepp! These creatures are in fact Hattifnattar in their region of origin. But I guess they are known as Hattifatteners in those places where Mumin is known as Moomin. They are strange creatures, no question about that, but that's no good reason not to be printable, right? ;0)

    I played around a bit, and it appears that I get results when I lower the resolution settings. I have no clue why that is, though. Maybe because a thunderstorm is coming up soon, or so. I'll try printing a few.

    BTW.: The model is at least partly parametric, though probably not very robust. The spine can be wiggled and resized, and the eyes may be moved around to make different looking Hattifnattarna. Eventually, the intention is to print and put LEDs in them to make them glow at night, while they hide between the potted flowers.

    Screenshot 2025-12-23 141548.png
  • MDesignMDesign Member Posts: 1,267 PRO

    It's because the fine setting in the export settings is probably not fine enough for your particular model. I've run into this multiple times and generally just use a custom setting. or export via step and then let my slicer remember how fine to import the step file.

  • _anton_anton Member, Onshape Employees Posts: 506 image

    Our sincerest apologies if you can't meet the deadline on such an important project.

    But yeah, I can't actually reproduce the badness in PrusaSlicer, regardless of export settings. What settings did you use?

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