Out of context: Reply #4
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I get asked this all the time, and it's one of The Reaons I really should get myself a small but powerful CNC mill.
If you're ok to 3d print them, try and go for a resin printer - they're actually quite cheap to buy these days, for about the dimensions that you're looking for - I think imbecile's got a recommendation in the 3d Printing thread here.
Other options are to buy metal discs and chemical etch them - still fiddly as you'd need to do them in two passes (front, then back) and likely have a laser-etcher describe the design through a black mask (as I imagine hydro's coins above might have been done?)
Failing that, a laser that can work on metals directly, but the sort that can do tangible physical relief are out of my sphere of understanding, unfortunately for me.
- huh. Hydro's were actually moulded? Interesting. BJAdams links to these, which look to me like they've been done with a metal-specific laser...Nairn
- Ah no, they're moulded too