Shredder & Extrusion Combo v3.1 – Project ‘Zoe’


Status : tested

Efficiency : 3 out of 5 stars

Design : 3.5 out of 5 stars

Safety : 4 out of 5 stars

Price / Value – Bazar : 3 out of 5 stars

Power consumption : 3 Kw

Mass : 102 Kg

Capacity : 5 – 40 Kg / hour

Build – time for beginners : 7-10 days

Build – time for experts : 1-4 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 : 700 – 1500 Euro

Bazar price : ~1000 – 2000 Euro





  • Safe hopper – with optional door. When opening the hopper, the machine will stop automatically.
  • Very precise auto-reverse when jamming. It stops after 3 trials and gives visual and audio feedback.
  • Status lights : Ok & Error
  • Emergency and reset button
  • Various motor protections (thermal & magnetic).
  • Jam detection for extrusion mode.
  • Rigid, flexible and modular framework – enabling hacking and extension. The base plate is 15 mm thick.
  • Compatible to upcoming addons : automatic injector and fine grinder to print PET directly.
  • The legs have M10 threads on each end so you can connect levelers or wheels. The legs have also extra holes to install easily extra sheets all around.
  • Extrusion hopper can be easily detached.
  • Thermocouples (sensors) have clips, easy to detach.
  • Complies also with basic regulations in schools.
  • Stops automatically after one hour of inactivity.
  • Stops automatically when motor heat exceeds tolerances.
  • Stops automatically when extrusion barrel is not heated up.
  • High quality cables and wiring according to industrial standards.
  • High precision mounts for shredder & extrusion, making sure everything is aligned perfectly.
  • Won’t start when power is back.
  • Control box has enough space for future upgrades as the advanced extrusion and/or injection control.
  • 6 quick speed dial. 

Specifications / Package content

  • Industrial screw – 26 mm diameter
  • Single phase – 220V
  • Motor  2.2Kw – 3Phase ( new & with warranty)
  • Reducer 1:30 ( new & with warranty)
  • 5 Heatbands
  • Aurduino based controller for safety and system control
  • VFD/Inverter (to run 3phase motor and speed regulation)
  • Assembly time with basic hand tools, around 30 minutes
  • Protection shields are in stainless


  • blades wear out
  • plastic jumping around, needs ‘plunger’
  • for shredding PET bottles, please consider to use at least 2.2+ Kw, 1500, RPM at 1:40 – 1:50 

Please checkout out our assembly guide and there is also a dedicated page for fixes

Build issues

  • tedious, long and error prone assembly
  • lots of grinding needed to make hex-bar and washers fit
  • improper driveshaft alignment may break driveshaft
  • welding stainless with improper welder leaves lots of spatter, hard to remove
  • frame needs to be more rigid than shown
  • blade tips come often too sharp and without grinding the tips wear out in no time

Smaller DIY alternatives

Please find more on Pinterest, GrabCAD, Google Images and Instructables

Extreme cheap variant with a planer


Manual hand driven shredder


Paper / CD / Credit Card Shredder Hacks


Commercial alternatives

Small shredders

Big shredders

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