P3Steel – This is a design for a 3D printer similar to the Prusa i3 but made out of steel. The advantage of this design is the rigidity and strength. Also because the axis are cut from steel they are forced to be straight. Here is a link to the reprap wiki about the p3steel.
I’ve been contributing 3D printable designs on Thingverse. Here is a link to my Thingverse Profile.