Prusa open X carriage with bearings.

This is a derivative work of OpenX Carriage by Buback.

I wanted a rock solid X carriage for my new Mendel Prusa. So after looking through Thingiverse I found Bubacks openX carriage. the problem is that even with a heated platform the edges want to warp when printed on a cupcake because they are so close to the sides of the platform. I completely redesigned the Carriage but kept the great shape.