Sponk - Balisong Trainer
thingiverse
This thing was designed with Tinkercad and can be edited online at https://www.tinkercad.com/things/bZeLg7qJXW0. Assembling this project requires 1/8" metal rods, which you'll need to attach according to the design. Be prepared to drill out the holes in the blade to accommodate slightly larger rods for smoother movement.
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