I want to cast some basic copies of parts and then make some additions and
changes to the plastic mold. I will then re-cast a negative mold to create
the metal part. Right now I'm thinking of aluminum parts but right now this
is more hobby than anything. How would I tell if a product is made of
styrene or polyethelene and what do they melt like? Making an injection
system will be simple if thats whats needed.