The mugs should've been cast in 304 steel.

I've sent a quote request for 20,000 mugs made of 304. Also sent a plain text link to this thingiverse page of a Slayer Stout mug (hopefully that doesn't flag the message as spam). Maybe I'll get a kickstarter going, or one of those group buy things but I forget the name of the website I'm thinking of. Lots of fancy metal keycaps on there.

Shout out to thingiverse user Pandabeer30 who made the mug.