One little box, two strings, a webcam that watches the pen. Draw a rough shape on any whiteboard.
Set it up
Do these once. Everything saves, so next time you just connect and draw.
Pick a shape
Single continuous line, the way a single-piece plotter likes it.
Nudge the strings
Use these to take up slack and park the gondola inside the board before you draw.
How it is wired
One unit holds everything: the Stick 'Em board, both servos and both spools, so no wire is longer than 10 cm.
Motor 1 winds the LEFT string Motor 2 winds the RIGHT string.
Run each string out to a small pulley or screw-eye at the top corners of the board, then down to the gondola. The pulleys carry string only, no electronics.