Shredder v3


Status : updates planned

Efficiency : 3 out of 5 stars

Design : 2.5 out of 5 stars

Safety : 2.5 out of 5 stars

Price / Value – Bazar : 3 out of 5 stars

Power consumption : 2-4 Kw

Mass : 50 – 120 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

Buy kits and fully built machines here


  • 27 mm hexbar not available in many countries
  • 20 mm drive shaft to weak, may break as reported multiple times
  • blades wear out
  • plastic jumping around, needs ‘plunger’
  • jams easily
  • documentation incomplete, eg: material bill: important components like couplings, driveshaft, motor protection, VFD, etc… missing
  • incorrect assembly and weak supports will degrade the shredder box easily
  • 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


Powerful and safe variant from

Precious Plastic Pilippines

A complete re-design of weedo


Components / Sources

this section is in progress. we add here a list of providers for components, …

Buyer guide – Bazaar


  • The shredder should have a 3 phase motor which is by nature more efficient and runs smoother. You can run a 3 phase motor on a single phase 110/220 Volt outlet by using a ‘VFD’. If not, make sure it has at least 2 capacitors.
  • If using 3 Phase, a shredder should have  a VFD to control speed, a VFD also provides safety and fault protection as well over-torque protection
  • Please ask for details on the  motor power, the recommended power is 2.2 KW for standard house-hold waste, and 3-4 KW for stronger plastic
  • New and quality components are easily 1100 Euros alone. Be prepared to spend at least 1500 Euros for a good shredder in the Bazar. Prices may vary on different continents.

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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