OTF Comb

thingiverse

Print one of everything except the Spring catch, you'll need two of those. It's worth printing the bottom of the casing with support, but it's not required. You'll need a spring that fits between the two catches - I grabbed mine from the local ACE hardware. Go for an easier spring rather than a powerful one, as you don't want it to be too hard to pull apart. The comb doesn't require much force to extend it, since it's lightweight. On my printer, the amount of sanding needed to make everything slide smoothly was almost nonexistent. Your machine may have different requirements. I printed mine in PETG. Remember: this project is intended as a novelty item only. Don't modify it to include a real blade - OTF switchblades are illegal in several states. Be aware that schools and other institutions often have zero-tolerance policies for anything resembling a weapon. Use common sense.