Here is another robot capable of producing human-like writing and drawing. The AxiDraw SE/A3 can be used on paper sizes up to 11 x 17 inches. It can write with your favorite fountain pens and permanent markers. The robot has a rigid structure. It has a max speed of 11 inches per second.
The AxiDraw SE/A3 can hold drawing instruments up to 1″. You can draw from Inkscape using the AxiDraw extension. It works with mac, Windows, and Linux machines. You can program it through a command-line interface or using Python.