Plastic string maker cube

Plastic string making tool that uses a knife or blade to cut bottles into usable strong string.
The point of the screw holes on the top is to screw in and hold a blade in place

link to how its meant to work: https://www.youtube.com/watch?v=TRy2sD_k57g

*this is a protoype, have not tested it yet but would love if someone would and send feedback. *