Prusamatic motorized conveyor build platform

I recently upgraded to a MakerGear Prusa Mendel from a Cupcake CNC with an automated build platform, and I missed the automatic ejection of parts out the front. So I designed a super-sized conveyor platform, re-using the gearmotor and also making use of AVataRR's paper + kapton belt design.

Video of it working: http://natetrue.posterous.com/automated-prusa-mendel-3d-printer-win-go-prus

In addition to the printed parts, it also requires:

• A Kysan DC Gearmotor A20RU-12V36RPM-15.5 (same one as the Cupcake's ABP)
• 200mm and 212mm lenghts of 1/2" EMT electrical conduit from a local hardware store
• 3x M4x20 bolts
• 6x M4 nuts
• 3x 624ZZ bearings (4mm x 13mm x 5mm)
• 5x M3x15 bolts
• 1x M3 nut
• Quite a bit of polyamide/kapton tape (the wider the better)
• Some silicone sealant or rubber cement

Known issues:

• The DC gearmotor is almost not powerful enough
• Sometimes the belt 'wanders' one way over time and gets gummed up against the roller holders
• A belt this big doesn't stay very even