Still working on it so things will change.
A redesign of gzumwalt marblevator design with a wheel for the lifting instead of the step`s.
Check out the video: https://www.youtube.com/watch?v=OP2o0gtpFbM
Original design: http://www.thingiverse.com/thing:60778
Have also attached my current sketchup drawing But it is not printed or tested.
Ask if you have any questions.
Update 26.04.15: Added v2 of the wheelbase and base. Check the stls for the one you want. The idea with v2 is that you can pop the wheelbase out of the base and insert it into a new base with difrent track. Added starting track, you need one off the 3 to be your first track. Added the track witch is the same as gzumwalt`s but they have two smal notches on each side to attach the arms. Added the arms for the tracks see Tressel stl.