I added an parts to support geared steppers. The 8mm shaft is shorter then a standard nema17 so I had to offset the motor mount. With a 27:1 geared nema 17 motor (http://amzn.to/1Xpih7N) I can do vertical movements. The parts are :
Motor Plate for geared stepper.stl
herringbone gears for geared stepper.stl
Geared Nema17 Adapter.stl
The End Brackets use 2 608 bearings each (for a total of 4) (http://amzn.to/1TaW1z5) to support a 8mm shaft. I drilled a 3mm hole through the shaft for the herringbone gear & the gt2 pulley.
I'll be updating this in the coming days with a BOM...
I redesigned the belt tensioner and am not using this one, http://www.thingiverse.com/thing:1564560. It keeps the belt more inline keeping more teeth in the bite of the pulley while putting less force on all the parts...
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