Does anyone build them? here is mine https://www.instructables.com/id/Rubber-band-car/
just thought i would coment.
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and if you build the car it has that, and 4 wheel jelly suspension!!! its probably the first knex car on this site with both and 18 other realy cool features!! you should build the instructions are now made and the mods are coming!
my knex mini does use rubber band power (but its optoinal) it doesnt move very fast becuase of the weight but if you take the body off its realy quick! im posting mods for it soon and it will also show how the rubberband power works!!!!!!!!!!