Is the 58mm size for the thermal printer just a straight up lie? Even 57mm paper doesn’t fit.
It’s not a lie.
I use 2-1/4" (57 mm) thermal paper in my DevTerm’s printer. I grabbed whatever weird brand Amazon offered me first when I searched for it.
That said, the novelty of having a receipt printer wore out pretty quickly for me. I ended up buying a bigger thermal printer (USB/BT) that can make labels too.