This is a marriage of two designs that have been submitted on Thingiverse by dbailey and flurin. I loved dbailey front foot support but it did not give me the tensioning that i needed. Additionally, I loved how flurin designed his belt tensioning system, but i found too much upward flex and the side supports limited y-axis travel. This design uses all the original parts included in the Ord Bot BOM except for the feet. For the pulley you will need an M5 nut. The two belt tensioning screws are M4x20. You will also need 2xM4 nuts. No support is required.
Update: 12/3/2013 I added a back foot to support the rear of the machine. It follows the same design cues as the front foot.
Part was designed in Solidworks. First layer is .1mm. Remaining layers are .35mm. No support. Top and bottom 5 layers are solid. The rest is 70% infill.