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I made one, with kanthal heating wire I had for vaping and a 10v DC power pack, but I'm having an issue. The foam melts/shrinks too far making it impossible to cut to accurate dimensions. I increased the length of the wire so that it is no longer glowing red, but I have the same issue.
I guess I'll have to spend £9 on a 3KW kettle then, dam I haven't spent anything yet on this project, I had all the stuff already.
Would I be able to re purpose an old 650w electric vegetable steamer, or would I need more power?