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I saw this yesterday and thought if it folds without splitting it'd maybe work with a bit of hacksaw & file to shape. Picked one up so will give it a go when time/attention allows.
https://www.fredaldous.co.uk/products/copper-blank-cb96-100-mm-square
Possible useful tip for setting gap width, a 20p coin is the same thickness as the top of my no.7 blade.
rhb
I did my first test cut (a dog collar tag) on some copper sheet and it turns out that I either have the wrong type of copper (annealed maybe?) and/or also the wrong type of end mill (upcut). The edges came out a bit torn up.
More copper and more end mills purchased. Because everybody loves expensive rabbit hole hobbies.