Grinder v1.2

This addon or stand-alone machine can be used to decrease flake sizes of your shredded plastic down to 1mm. A smaller flake size has a direct quality impact, for extrusion and injection. You can also print it (PET only) then much easier since there are number of granulate printers already out there.

The method used in this design is standard for industrial grinders. You may find the knifes on scrapyards as well.  

Release date : 10th of October / 2019


  • you can use the existing v3 shredder box to make this work
  • you can make the knifes yourself if you know how to weld and use an angle grinder and a belt sander (for knife makers)
  • the design is scalable and already proven and in production (


Status : re-design / work in progress

Efficiency : 4 out of 5 stars

Design : 3 out of 5 stars

Safety : 2.5 out of 5 stars

Power consumption : 700 Watt

Mass : 12 Kg

Capacity : 40 Kg / hour

Build – time for beginners : 5 days

Build – time for experts : 1 days

Required machines : drill press, stick welder, power tools

Recommended machines : lathe (hex bar, drive shaft, couplings), CNC (couplings), MIG welder (stainless), bench grinder, angle grinder

Material bill : 300- 800 Euro

Bazar price : ~1000 Euro

Components / Sources

  1. Hexbar, recommended : 27 mm and higher
  2. Rotary & stationary knifes
  3. Housing: you can use or recycle your v3 shredder
  4. Motor: you can your v3 shredder motor but recommended are faster motors with 700 – 1200 RPM

Commercial alternatives

Small shredders

Spread the love