This project is pretty cool, it's a ballistic knife, wich means the blade shoots out out the handle !
You will need a compression spring, 10mm in diameter 30mm when compressed and something like 70mm or a bit more when uncompressed.
I used the springs in an old Well bipod (there are 2 in each "leg").
Use a bit of epoxy or hot glue to attach the spring to the bottom of the handle.
You will also need a 25mm m3 screw.
You can print the blade (use flexible filament if you want to shoot at people), or print the blade mold (m3 screws to assemble the 2 parts of the mold) and cast flexible resin inside to get a safe flexible blade. I used this method to make about 20 blades with no problem.
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Viking reenactor and history enthusiast, I like airsoft, drones and experimental archeology, and 3D printing and designing of course :)
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