I got the stl files from http://www.thingiverse.com/thing:194586
Though there wasn't info on actually swapping them out. So I am going to do a walk through.

Step 1: Printing Parts

Using the Printrbot simple I was able to print all the parts from the stl files provided.
<p>Thanks - this helped clear up a bunch of questions I had just looking at the blueprints. Happy to be printing again after breaking my Y-axis string!</p>
I got the belt and gear on the printrbot website for $20. I think it's the G2 belt or something. The bearings are standard skateboard bearings I had laying around.
<p>Where did you find the bearings, gear and belt?</p>

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More by rcrossen:Printrbot Simple X-axis Upgrade Printrbot Simple Y-axis Belt Driven Upgrade 3D Printing Snaps 
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