Sense 3D review
Ok I didn't build this one, I just bought it. It's a portable scanner, very easy to use, produced by Cubify. This is a link to their website.
If you want to buy a second hand like me make sure they give you the activation code as well, or you won't be able to use the software. I bought it for about 400$ (AUD) when new it was around 600$ (even cheaper now), including software activation (you have to download it though).
I tried scanning many different objects of different sizes, and some people, including myself. As you can see from the pictures, it gives its best with people and medium objects without straight surfaces. When used with small objects some details are missing.
The software interface is really easy to use and it shows the 3D model during the scan, so you can see the gaps and scan where needed. Sometimes it loses track, so you have to go back until it finds it. It usually happens when there is not enough light. I think it works better daytime, when the light is diffused and not coming from one source only. Light affects the quality of the scansion.
The software allows the user to modify the model, cut it, get rid of some parts or defects, improve the colors.
In the following pictures you can see the items I scanned, the Sense 3D software, and the final stl models (opened with STLview).
These are some smaller objects
These are examples of people I scanned and printed. It's very realistic, detailed and impressive!
Conclusion
If you need a scanner for small object or precision applications, this is not what you are looking for, but if you want to have some fun scanning and printing your friends, this is the cheapest option on the market and it's really easy to use.