plastic bottle string cutter

This plastic bottle cutter that I have designed because I didnt find a suitable one out there works well with a small piece of a small utility knife blade (picture 2 the one on the top). It is designed to be screwed on the side of a table or a workbench. The string thicknesses are: 2mm, 5mm, 10mm, 15mm and 20mm. I hope you will have fun with it :)