Recycled plastic as charging for 3D printer

I’ve always wondered what could be done with recycled plastic since I have saw Dave vidéo on it and with the democratization of 3D imprimente using plastic roll, why not used it for 3D imprimente

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3D printing

Here is a older topic, about making print filament.
It took a lot of time so we decided to leave it out of the project for now, bit still working on it.
filament making

There is a video of a home made Filament Extruder over in this post
http://onearmy.world/community/forums/topic/is-it-possible-to-prepare-material-for-3d-printer/#post-67156

Hi there,
I would like to know wich other plastic is recommended for mixing with PET for making PET recycled filaments.
Thank you very much for your support!