Recreator3D bottle cutter using 18mm snap blade

I really struggled to get the original design with bearings working reliably, so I did this remix using 18mm snap blades, which I have hundreds of. The blade will cut about 10 bottles before you need to snap that section and go to the next. It's also adjusted to take a couple of British penny coins as the anti-wear plate (should still take a US 1-cent coin with a dot of superglue to hold it in). It requires 2x 6mm (M4 thread) brass inserts for the blade clamp, which can be heated with a soldering iron or cigarette lighter before being inserted.