About this 3D model

This is an X-Axis carriage for my attempt at the Gada Intermediate Prize (for RepRap). The carriage mounts to four bearing plates (which each hold three bearings), and thus moves along the X-Axis. This is a work in project; as you can tell, only the carriage exists, not the bearing plates, nor the other axis/related drive systems. This is purely experimental, also, as I don't have a 3D printer to print it on (yet; getting Mendel together has been tough!), so this is not known to print successfully. The two holes are M4 diameter. They are used for mounting an extruder/head. The two columns/hole in the middle are quite obviously where the extruder supported/mounted through.