This is another PET bottle cutter. I looked at what others have made for this function and the designs did not work for me. I try to use what I have on hand to make what I need or want. This is a very simple design with a base and a two piece top. It uses a standard reversible box knife blade. And usually I would use whatever nuts and bolts I had on hand but this time I was out of what I needed. The hardware is all 6-32 flat head bolts, washers, and nuts. If you want to use metric then M3 will work. You should fasten the fixture down to the table or base that you are working on to keep it steady. I've included the .gcode I used to print it and also the .stl file so you can slice it specifically for the printer you are using.