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No tungsten oxides really fast, then u need a vacuum chamber or inert gas atmosphere. It is probably not impossible to make but you probably have to experiment diy then. You would need to go for inconel or just pure nickel, I would either 3d print the metal or stamp it into a shape before machining it to specs. To save cost but anyways the process is so expensive that a block of nickel is maybe not that bad. Or you could do some weird thing with a very thick electroplating of nickel onto steel maybe 1cm then machine that. Steel can reach 500c before it begins glowing at 600 celcius. So if cooling is good in mold maybe it is good. Idk
Clearly it works, you can see the mould halves moving together and apart, including the release mechanism. Just because they're not casting something with it at the time doesn't mean it doesn't work...
