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Sorry, I'm new in 3D printing and modeling and I need help.

I bought a 3D model with a hollow part of the body that doesn't print on my printer normally (with very high resolution (layer is 0.12 mm, the nozzle is 0.4 mm) because the walls are very thin). I tried to make it as a solid in MeshMixer or ZBrush, but I can't. Can you help me, how I can fix this defect?

I use Cura for slicing.

I know, that I can take a thinner nozzle (0.2 mm) and Cura will slice it better, but I want to make this model solid so I could print it with nozzle 0.4 mm.

Hollow part of body

How Cura have sliced that

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  • $\begingroup$ that is 100% a problem of the model. Those chest areas have their vertices inside-out. $\endgroup$
    – Trish
    May 14 at 17:20
  • $\begingroup$ @Trish, Hi! Thank you for you answer. Can you help me fix that model? (I'll share model for you) $\endgroup$
    – 0xDEADBEEF
    May 15 at 16:29
  • $\begingroup$ 3dprinting.stackexchange.com/a/15881/8884 could help $\endgroup$
    – Trish
    May 15 at 17:39
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This is a problem with the model, you need to make sure that the model isn't hollow. You might be able to get around this though if you use scaffolding, it might recognize the overhand hand build supports for your print inside of your print, you just might have to mess around with the scaffolding settings a bit.

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Print with Supports, Standard, Everywhere.

You'll get some external supports that may require sanding or scraping to smooth the attachment marks (it may be possible to use further Cura tricks to block those if this model normally doesn't need supports), but "Everywhere" will cause Cura to create supports that sit on the model -- hence inside the hollow body. I've seen them inside a 3 mm diameter horizontal hole. You can then adjust "support infill" to create what amounts to a (slightly inefficient) infill in the part of the model that's made as a hollow.

I'd recommend trying this first with a large nozzle and thick layers, to speed printing for the test ("draft mode"), but I have every reason to believe it will work.

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