[bigiain]

How thick and what material is the sheet metal? Is it something that fit and be machinable on a cheap 3018 CNC mill?

(Sorry if that's answered in your linked post, I skimmed it perhaps a little too quickly...)

[gkasev]

I used 4mm thick, black anodized aluminum plates. I'm not a machinist and do not know the specifics of your CNC machine, but you will most probably have no problems machining these plates.

[bigiain]

Thanks!

(I'd be able to make those, I would probably need to do it in a few passes though.)