This is a butterfly knife kit card. This is just a trainer (not a functional knife) to do tricks on. It is a great gift for someone who wants to learn how to use a butterfly knife and only takes 1.5 hours to print and 5 minutes to assemble. All you have to do is to cut out all the parts and use the screws to connect the handles to the blade. It's fine if the screws don't fit flush, as long as they get in its good enough.

Print Settings:

0.12mm layer height

15% honeycomb infill

3 walls

Supports are optional for better results 

EDIT: I added a new, heavier and sturdier version of this kit card which takes ~2 hours to print.