I would rather measure parts and make models from scratch than do 3D scans. Most parts are probably simple enough. 3D scanning could be a good second source to verify some tricky measurements like curved surfaces and mating interfaces. For making parts, there has to be some competitive shops that can make stuff for you with tools that are 10x the cost of your budget with much better results. MakerBot ≠ 3D printing (a very crude representation of the possibilities of 3D printing)!!!