Chris recommends 0.8mm in the book, I know a couple of members are using 0.6mm wire. I can't see any issue with 1mm wire.
As i understand it the larger the diameter then the larger the current, meaning the hotter the metal will get, meaning you will need to put the welder on a lower setting to prevent yourself from blowing through.
Have a go on some off cuts and see how it goes.
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