Remember the days when we used to throw out our ink jet cartridges or toner cartridges, now they are recycled into new carts. The same will happen with 3d plastics. Someday soon when you go to Stapes or Office Depot to get your new filament, you could turn in your old 'stuff' which will get recycled into new filament. We are just on the front end of the curve, but it will happen. BTW PLA is recyclable right now. Russ