When I was a kid, pop built a motorized Lego bubble blowing machine. He attached the wand from the bubble bottle to an arm of Legos, which was attached to various Lego bricks, pulleys, rubber bands, and the Lego motor that perpetually dunked the wand in and out of the jar of soap. Add a small electric fan and presto! Automated Lego Bubble Blowing Machine.
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