Bronzebullion

Thanks for taking the time to reply, as well as for the advice. Although it's a very stupid object to cast, it just goes to show the dumb things people will ask for, when they find out you cast metal.

okay, so I have been melting and casting metal for about a year now, I use a metal trash can, with a plaster of Paris sand mix lining, I use charcoal to power it. I mostly melt bronze and make swords. My friend from school asked if I could cast him a very immature joke object as a gift. I had him 3D print a plastic model of it to make a mold. problem being the object in question is very oddly shaped. I tried to to use green sand, which failed. I then encased the object in plaster of Paris and tried to pour.. which failed. my new hope to make the object would be to use some sort of foam sacrifice method. I would like to make a mold using silicon and fill that mold with a foam like material, in order to then bury it in sand and pour into it. Down to my question, will this new method work? And does anybody know a material that Will work like foam but is able to be poured into a mold?