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I do not know anything about 3D printing, let me know if another place might be more appropriate for this post.
My friend about three months ago was in a catastrophic motorcycle accident. He was hit by a texting F150 truck driver. He lost his leg, an eye and has had pretty much full body reconstruction, including jaw and face. He was wondering if he could 3D scan in the helmet he was wearing with all the first responders/doctors (who helped save him that night) signatures then give each one a copy to thank them. He is in Ontario/Brampton area. He can pay for it.
Picture is not of actual helmet. Being sent down from up north right now.
Yup all the bumps and dents. Knowing him he would leave the viscera on for effect if. He also wants all the signatures as well.
Yeah like someone else mentioned, printing in color AND detail is tough. Resin prints have the best detail, but you would have to paint it after the fact.
I think binder jet printing is what you're looking for, after you get the scan.