Note the sign is not included, it was simply used to accentuate the seesaw motion.
Designed for use with multiple marbles.
Designed to use the base assembly of the Marblevator Mini. Simply push out the worm gear and Bowl Track, then snap on the Seesaw track and replace the worm gear.
And finally, if you don't mind manual labor, the hand cranked version is available.
Designed using Sketchup 8 and printed in PLA on a Replicator 2 using Makerware 18.104.22.168. "Track.stl" and "Basin.stl" were printed "High" resolution, the remaining parts printed in "Standard" resolution.