Download at
https://www.printables.com/model/394972-folding-pocket-utility-knife
This Utility Knife is very strong and easy to print. All you will need is some glue and one small spring. One from a pen will work. Use the stiffest one you can find.
Rafts:
Doesn't Matter
Supports:
Yes
Resolution:
0.2
Infill:
100
Filament:
FilamentOne PLA Red Glint