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A motorized "Brio type" train climbs this seesaw--and its weight flips it down the other side.  The track (actually it's a channel) is 3D printed and can be customized as to angle, radius, length and color.

http://www.thingiverse.com/thing:65965



 

Step 1:

Start by printing track.  I left holes to screw the track to plywood.

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Bio: My book, A BEGINNERS GUIDE TO 3D PRINTING: 14 SIMPLE TOY DESIGNS TO GET YOU STARTED is now available. If you want to design your ... More »
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