Vacuum Forming Molds
hey guys ive been reading a lot lately about vacuum forming and homemade vacuum forming machines (kudos to everyone who has made one by the way, theyre awesome), because i want to start early on my halloween costume this year and after some research i found vacuum forming would be the best way to make my costume. so my question for you guys: what do i make the molds out of? unfortunately, everywhere ive looked, there hasnt been a real detailed description of how to make the molds for the parts, its usually more along the lines of "now put your molds on the platen and place the heated plastic. . ." without describing how aforementioned molds came into existence. thanks a ton in advance!