Institute of ImaginationRobot LabRobot Lab

Step 3 of 7

Fix the wheels

Push a bottle cap onto each skewer end, open side in. Leave a finger's width between cap and straw. Spin a wheel. Do the wheel and axle turn together?

Front view of a box on wheels: a straw taped under the box, a skewer through the straw, and a bottle cap wheel fixed on each end of the skewer