Aaron Francis wanted a pen-plotter that could write out thousands of pieces of direct mail. He bought the Axidraw from Evil Mad Scientist and liked it a lot — but wanted some way to have one robot write out multiple pieces of paper, unattended.
So he took the Axidraw's plotting mechanism and put it on a massive eight-foot-long frame, producing a robot that can handle 14 pieces of paper at a time.
He published a thread on twitter documenting the whole process with photos and video, and it's pretty fascinating. My favorite part was where he got the Axidraw to hold two pens at once ….