Makelangelo

The Makelangelo vertical plotter can draw over A2 size pictures (16-1/2x23-3/8", 420x594mm). It can be attached to a wall, window, easel, or whiteboard.

There's also

• step by step guides with pictures (https://mcr.dozuki.com/c/Makelangelo_3_and_5_Guide)
• and multiplatform Java software to drive the machine
• and a thriving Discord community