Having built a "vanilla" (original design) i3 and also a rework i3 the main differences are:
- rework uses M10 threaded rods for all of the Y frame vs M8 and M10 for the vanilla
- Z motor and top mounts in the rework are a little "beefier" (solid)
- extruder is turned 90 degrees in the rework and has a fan shroud
- Y belt has an adjuster in the rework
- X motor and idler are similar design but with the rework it's easier to use a tensioner for the X belt
- rework has different end stop mounts
Steve
My updated Instructable on our Prusa i3 Build
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www.instructables.com]