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So I have a 3d scan of a face, pictured:

enter image description here

And it has no thickness whatsoever, I'd like to add some so that it can be 3D Printable (my printer can handle the vrml/obj format and tons of colors). I've tried solidify but it puts a bunch of cracks through the face:

enter image description here

And I've tried using the bisect tool, then hitting f to fill the holes while what I bisect'ed was still selected, and all of the holes won't fill. I've also tried some of the solutions from this question: How to make a perfectly flat bottom for 3D-printing topographic relief? but it creates those same cracks.

Lastly I've tried selecting every vertice and extruding backwards, and whatever this is happens: enter image description here

Any ideas? I'm sorry if this has been answered somewhere else.

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  • $\begingroup$ Unfortunately there are no tools within Blender that can handle 3D scans very well. Blender - as a 3D modelling software - uses quad-based topology, while 3D scans are usually triangle-based and thus lack good loops to work with. However, I've seen people doing amazing things with MeshLab and NetFabb, if you want to give that a try. $\endgroup$
    – metaphor_set
    Commented Apr 3, 2019 at 16:13

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I had great results Blender (2.8.2) with the Solidify modifier.

Set mode to Complex, Thickness fixed at 1.00 (1mm offset), Offset of 1.0000 (for outward expansion toward the normal).

Checked options Fill Rim.

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The 3D print plugin is nice for fixing up a mesh but otherwise I used to just use the decimate modifier and create a new mesh from a scan mesh. Also make sure you've tried selecting all vertices in edit mode and using the 'remove double vertices' function (or remove doubles in 2.79). Then using Crtl + Shift + N to set the normals (untick that box in the bottom left corner though) (in 2.79 it's just Crtl + N and there's no tickbox).

What it looks like is that for whatever reason the scan mesh isn't whole, like there's separate islands of vertices which would give the effect of the cracks

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