RepRap will make plastic, ceramic, or metal parts, and is itself made from plastic parts, so it will be able to make copies of itself. [...]
The RepRap build cost will be less than $400 US for the bought – in materials…

Also, the RepRap software will work on all computer platforms for free. Complete open-source instructions and plans are published on this website for zero cost and available to everyone so, if you want to make one yourself, you can.

*exciting

The portable printer from start-up Zink is about the size of an iPod. It prints 2×3 inch pictures, but larger formats will be available in the future. The printer has no ink cartridges, which enables the small size. Crystals in the special paper change from transparent to colored when heated. / Credit: Zink

Tiny Printer / Zink