3D printing at home is gaining popularity. This is because it becomes affordable to order your own designed objects at companies that are specialized in Additive Manufacturing.
An example is iMaterialise, here you can upload your design as an stl file and after a couple of days you will receive a 3D printed component.
It is also possible to buy your own 3D printer or for the hobbyists to build their own. Makerbot and PP3DP are two companies that are offering affordable 3D printers for domestic use.
Reprap is the most common printer build by hobbyists. There is a whole community around Reprap that optimizes the printer and share their experiences. Reprap printers are containing a lot of 3D printed parts. So that it’s easy to multiply themselves.