Hi there! We’re mechanical engineers from the University of Dundee. We’ve actually seen 3devo, as the makerspace in the art school has one of the filament makers! One of the staff said students had used it primarily to experiment with making different colours of filament. We drew some inspiration from it. There are industrial equivalent machines for cleaning, shredding and extruding that we thought a company could use for a larger scale recycling scheme.
I haven’t heard of the other initiatives, thank you for highlighting them! I will have a look into them.