The Walldrawer project is a usual maker project which is suitable for old and young.
There is so much fun in watching it working on giant sheets, walls or whiteboards.
I modified usual constructions, now everybody can build one on a 3D printer with an Arduino UNO
or, for the more engaged Makers, a selfmade PCB with ESP32.
My solution is below 30 bucks, beside some parts you may find around.
I published the full project in German language on GitHub:
https://github.com/Pontifex42/Walldraw
There you find all files, code, instructions, part list photos, videos and all you need.
If requested, I'll translate everything to english.
The author hasn't provided the model origin yet.