Noted: I opted for a design created by engineers at the University of Wisconsin in Madison. Called the “Badger Seal” after the school’s mascot, the design uses materials that are easy to order: vinyl tubing, cord locks, rubber twist ties, and elastic string. The instructional videos were easy to follow; while I didn’t time myself, I’d estimate it took about 20 minutes total to snip all the various pieces of tubing and ties, and put them together.
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