ThinkFun the Amazing Spring system !!

This ( amazing ) Spring part will make your car run on the power of .... Plastic .
No need for a rubber band .. no need to print with soft (expansive) filament.
Just print , connect and .. go Go GO o o o .

This Thingy will fit the entire ThinFun sets and parts .

Instructions:
1.print this spring.
2.connect to some car/track Thingy you built (using the ThinkFun Sets and parts)
3.pull your car/track back until the spring is loaded ..
4.let go and watch it go !
5.press "like" button :