I am making a doll head for a 3D printer to print.However, hollowed out it was not thick enough to be breakable.I have learned how to use extract to change the thickness, but this feature thickens the outside.Is there any way to thicken the inside of the object without changing the outside?Please let me know.
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Maybe this helps:
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Thank you. But no matter how many times I do it, I can’t do it like your video … I’m sorry to trouble you, but could you write down how to do it?
Sorry, I have no idea how to put that into words. 
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Is it right that this is an object that has a thickness already, and you want to make it thicker?
In that case it’s probably best to separate the inner and outer part again first , delete the inner part and start over with thickening the outer part.
To separate the inner and outer parts, you can try polypainting the edge that connects them, then delete these polygons (use the hide tool for that)
Most brushes across sculpting programs behave as if it has a “sphere of influence”. This makes it challenging to sculpt or mask at areas with it almost always affecting the backside of a subject’s “shell”.
Thankfully, Nomad carries across a setting that behaves similar to the way I learned in ZBrush; a brush settings toggle for backside vertices:
With the mask tool selected, go into its settings and select the filter tab to find this
Now, the exterior can be painted with a mask while the inside of the shell is minimally affected. Toggle the unmask option and clean up the inside as necessary. For a head-shape, you’ll also want to work this in conjunction with hiding parts of that shell for easier access.
With the inside cleanly unmasked, switch to the Gizmo tool, adjust the pivot point to optimize the central location and manipulate the global scale ring (peach) to effectively thicken the shell.
Finished result…
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After masking only the inside of the object and using the extract, I was able to add thickness to the inside of the object!
I got a lot of hints from your answers. Thank you for your cooperation!
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