3D scanning to 3D printing - What is the current hotness?
Product: 3D Scanner 421
Operating System: Microsoft Windows 10 (64-bit)
There's "photogrammetry" which uses a bunch of pictures of a still object/subject (very, very still!). You can use your phone camera for this, or any camera which saves focal length information in the EXIF data for the image. Locking the focal range, and staying a set distance from the taget helps with good results, A LOT. There are free solutions for this, but at $150, ive found AGI Photoscan to be a killer deal.
Cleaning the scans up, however, can be very challenging for those not familiar with the process. This is where most people give up. Watch YouTube videos, use the resource links in the aforementioned wiki,and practice a few times, it's really not hard to figure out, IMHO.
There's also cheap handheld scanners (I.R. laser projection + I.R. camera + color camera) such as the Sense, XYZ, Kinect, and others. You can use software such as skanect to get the scan data, but again, the data is normally in need of cleaning. I picked up a used 3d systems Sense (v1) for under $100, and skanect is reasonably priced, although I can't recall the price.