Version 2 is here! (see at the end of the description)This is more or less a copy of the "Mini-shredder/Mini-filetador" from Takashi UtsumiIt is designed for wider blades: Width: 18mm - Thickness: 0.5mm The cutting edge length: 100mm (the whole paralellogram is longer)Links to the original: http://www.utsumi.com.br/pet/English/filetador/index.html http://www.utsumi.com.br/pet/English/dicas/minifiletadores_como_fazer.html http://www.utsumi.com.br/pet/English/Possible uses: 1) Weaving -- Make cool woven objects like those described on Utsumis pages. 2) Directly feed it into a hot end (to be designed) for printing (The melting point of bottle-PET is below 260°C edit: I sucessfully printed with 250°C) http://blog.reprap.org/2009/03/drink-bottle-feedstock.html 3) Feed it into into a re-extruder to make 3mm filament for bowden printers.After some testing with version 1 it is clear that PLA is definitely not suitable - the friction heat cuts right through the plastic after just a few 10m of ribbon. ABS might work but I think an incorporated L-Alu-Profie will be better.Edit: Version 2 is aviable ! This one uses an Alu-L-Profile for feasable wear resistance. You'll either need an aluminum-L-profile of the following dimensions or change the *.scad parameters. width = 25mm; height = 15mm; (length = 135mm) To make the production of the alu part easier a drilling & sawing template part is included.Building:v2:v1: (dysfunctional due to quick wear) Due to Friction heat the PLA walls between the slots wear out very quickly. Using:PS: Be prepared to be called a clutterer when starting to collect PET bottles.