It has been a while since I have done something like this.

There used to me a metal compound that we use that had a
low melting point. We used to cast it around parts that were
delicate and then machine keeping everything cool.
When we were done we melted the compound and
freed the object. You could do the same thing with a coke can.

I would guess you could fill a coke can with wax then cut
with a slitting saw on a mill or even on a drill press with a jig.
Use water as a coolant. You might want to freeze the can and wax.

w..

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