knicalvario on Nostr: SeedSigner KeithMukai 7xl ...

quoting
note1ghj…dzv5

I got it from c0pperdragon on Tindie. They don't make/sell them anymore, but the designs are public in case you want to build your own.

https://www.tindie.com/products/c0pperdragon/hot-plate/

https://github.com/c0pperdragon/HotPlate

I want another one myself, but I've been hoping someone else might pick up this project so I can just buy one instead of ordering custom PCBs, sourcing all the components, finding out a bunch of them are not compatible, ordering more components... you get the idea (or if you've done this before, it's more like "you know the drill")