It still uses 608ZZ bearings, but a rotary cutting blade is placed in between as shown in the image, for cutting the plastic bottle. This avoids the need to sharpen the bearings, and the blade is easily replaceable in case of wear.

I bought the blades on Amazon, but any rotary cutting blade with the same dimensions (Ø28mm) will work. In between the bearings, the smallest possible washer is placed. I just printed one as I dind't have one at home :D

Also two hex screws are needed, one M4 and one M8. Both 45mm longitude. A locking nut is placed in top of each screw to prevent it from coming loose on its own.

You also have to print the guide (BottleCutter GuideV2B.3mf) from the original model.