Thermalith: an open-source desktop label designer for NIIMBOT printers

I went quiet on the blog for a month because I was building this. Thermalith is an open-source desktop label designer and driver for NIIMBOT thermal printers: local-first, no account, no cloud, prints over USB or Bluetooth. Cross-platform on .NET 10 and Avalonia, with the reverse-engineered printer protocol pulled out into its own reusable GPL library.