Plastic Bottle Cutter/Stringifier

Cut bottles into long strips for filament makers or emergency lashing. Two F695 bearings cut the bottle like scissors. Lasts longer than razor blades. Two pennies keep it from cutting into the body. Adjustable between cutting about 5mm to 10mm strips. 

Print Settings: I used 20% infill with 2 walls and 0.24mm layer height in PETG.

Parts: 

• 2 M4 screws with flat tops (for height adjustment)
• 2 M3 screws (to hold the bearings)
• 2 F695 bearings
• 1 6mm rod
• 2 pennies

Instructions: 

1. Print all parts
2. Superglue pennies into penny holders
3. Superglue M4 screws into the hole in the bottom of the penny holders
4. Reinforce the superglue with the glue of your choice. I used alternating layers of superglue and baking soda. It instantly dries and makes a super strong, thick bond. 
5. (Optional) Use Lithium grease on the screws. Careful, many greases and oils make the screws stick more when screwing, not less! SuperLube practically acts like a bond with PETG! White lithium grease is good. 
6. Screw penny mounts onto the body on either side of the bearings. 
7. Sharpen the bearings. You can place the faces on a piece of sandpaper and rub in circles or use a dremel. 
8. Place bearings and screw into place. If they are too stiff to spin, loosen the screws a bit. They should have some resistance from rubbing against each other. 
9. Push the rod into the rod holder. 
10. Attach the rod holder to the main body.

Usage: 

1. Adjust the height of the pennies to be even with each other. The longest lines represent 5mm (top) and 10mm (bottom).
2. Place a bottle with the bottom cut off on the rod.
3. Push the bottom into the bearings until a strip starts to cut.
4. pull the end of the strip. It should start slicing.  

To sharpen the bearings, just rub the top of each bearing on a piece of fine sandpaper until it's flat. 

If you want to remix this design, here's the link. It is mostly parametric and should be easy enough to edit. If you look at the license, I'm totally okay with you making money off of this as long as you provide attribution. 

https://cad.onshape.com/documents/1bc0d1edcee5b10edd1ab3da/w/e0acebaf7ebfa57c70b6ea12/e/6d4b0f752b4126ea2c8bee3d?renderMode=0&uiState=63a2344523e7cc5d03dd75ef