PET Bottle Shredder

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PET Bottle Shredder
Description These shredders allow the use of the cut PET to be used in things like crafts and possibly for printing purposes.
Intended use industry
Keywords 3D printing, plastic shredder, recycle
Documentation language English
Appropedia user User:Kemyszka
Project status prototype
Project was made Yes
Countries of design Category:United States
Project affiliation Category:MOST, Category:MTU
Main materials plastic
Estimated cost USD 0.52
SDG Sustainable Development Goal 12

PET Bottle Shredder[edit]

Project developed by User:Kemyszka

This OSAT has been designed but not yet tested - use at own risk.
This OSAT has been prototyped.

You can help Appropedia by contributing to the next step in this OSAT's status.


Included below is three different designs for PET bottle shredders currently designed for 20oz soda bottles but easily expandable for use with 2 liter soda bottles. The first design is a simple hand held shredder which is the simplest design and uses the least plastic. This makes this design ideal for areas which have access to a 3D printer but which filament might not be as readily available. The second design adds a bottle holder to the simple hand held shredder. This holder was added to possibly aid in efficiency. The third design is a hand cranked design which also uses a bottle holder and spools the cut filament. These shredders allow the use of the cut PET to be used in things like crafts and possibly for printing purposes.

PET Bottle Shredders
Simple Cutter  
Simple Cutter V2  
Printed Simple Cutter  
Shredder Works  

Bill of Materials[edit]

  1. 3-D printer
  2. OpenScad
  3. PLA filiment
  4. Single sided razor blade
  5. 2 M3x6mm screws
  6. 2 M3 nuts

Tools needed for fabrication of the OSAT[edit]

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. OpenScad or other Cad software

Skills and Knowledge Necessary to Make the OSAT[edit]

  • Basic knowledge of your 3-D printer and software used to make the model.Proficiency with a slicer program and some basic hand tool knowledge.

Technical Specifications and Assembly Instructions[edit]

  1. Download the files listed above
  2. Prep your printer and load the .stl file and slice into a .gcode file
  3. Print cutter and clean any flash on the cutter slots
  4. Attach razor blade via the 2 M3 screw slots
  • Print time
  • 2hrs for simple cutter at 20% infill
  • Assembly time will be the amount of time it takes to attach razor blade
  • Approximately 2 minutes

Common Problems and Solutions[edit]

The cutter slots may not print fully open and will need to be trimmed with a razor blade. Cutter slots may not also print with even opening spacing.

Cost savings[edit]

Estimate your costs Hand Cutter

  • 29.58 grams of filament and approximately 120 minutes
  • $0.52 per cutter assuming filament costs of $20/Kg + whatever you value the time to set the print up at

Find a commercial equivalent

  • No such thing exists


  1. My own measurements of razor blade