When working with Styrene rod, what is the best way to bend/form the rod in order to make roll cages/exhaust? I have been using a lighter but I have noticed it produces not only black marks on the rod which needs to be cleaned off but more importantly it produces the burning plastic smell which I can imagine is very toxic to breath in. I have seen several roll cages etc. on this forum that have no black marks from a flame and was wondering if there is a better method to bend styrene rod/tube that I am not aware of?