These unique 3D printer designs might surprise you with their new twist on the typical.
The Selective Compliance Assembly Robotic Arm (Scara) is a natural fit for 3D printing. Not only is this system precise, but its footprint is tiny when compared with other 3D printers.
According to the RenRap Wiki, the RepRap Morgan can be built for less than $1,000. This design does require a little more precision in its construction. The typical Mendel design can be constructed from cheap, easy-to-find materials, but the Morgan requires many custom parts.