Most of those trash cans are injection molded polypropelene....
a few things about polypropelene:
the only thing that bonds to polypropelene, is polypropelene
the only thing that BONDS polypropelene to polypropelene, is more polypropelene.
when you liquify polypropelene for injection molding, it will always hold its shape to which it was initially molded to.
if you are looking at making leg pieces and such, you might call your local sing shop, or plastics wholesaler, and get some sintra (aka condensed pvc sheeting) and cutting it out, boilin it, and shaping it how you want it. Sintra will always hold its shape, and you can remold it over and over if need be.
