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        I built a propane-fired compression molder to form thermoplastic sheet into wheels in rigid aluminum molds.  This was to explore manufacturing thermoplastic spoked wheels for model kits.  The molder worked, but with too much flash.  A much more elaborate mold would have to be used, to cut or drain away the flash.  The wheels above were formed from a plastic CD mailer.  As you can see, there is a lot of flash, and I was not able to break it away by hand.