ABS Recycler for 3-D Printer Filament
Imagine a small 3-D printer that you use to produce useful household items with. Here is an example Instructable illustrating what I am talking about.
Now imagine that you no longer need an item that you have made. You toss it into the hopper of the machine that I have in mind and it is ground into small pieces. These pieces are then melted with acetone and extruded anew into ABS filament for your 3-D printer!
It may be possible to recover the acetone during the extrusion process since the acetone evaporates to restore the ABS.