good find zerohour.
I found a while ago that this concept also works with polystyrene (i assume it isn't the same as ABS plastic). There are a few instructables about forming your own plastics by "melting" down polystyrene with acetone letting it dry out then you have a hard plastic thing in whatever shape you formed it into.
I tried this out, it works ok for small things but i wanted to make plastic sheets and the sheet deformed somewhat.
I also tried melting down polystyrene (bad fumes) but it worked, melts down to a workable goo and can be put into forms and will make a sheet of hardend plastic however the plastic that is made is not at all flexible. It also destroys your fry pans
. Also need a lot of polystyrene do make anything of significant volume since polystyrene is mostly air and when melting it down all the air comes out.