How to build a printer

A developer successfully turned a programmable e-ink display (Xteink X3) into a wireless printer by implementing the Internet Printing Protocol (IPP) and using Bonjour for device discovery, allowing printing directly from macOS. To overcome severe memory constraints (only 6.8 KB of heap available), they created a transformation pipeline that processes incoming print data row-by-row, dithering it to black and white and writing directly to the display's reserved memory instead of buffering the entire 8.4 MB page in RAM.