This drawing machine is built with cardboard, hotglue and small inexpensive 9g servos from Ebay, and is programmed with an arduino.
First test
https://www.instagram.com/p/BI5v_bsAHSl/
Second test
https://www.instagram.com/p/BI590CKggTd/
The above video shows the Drawing machine #2 running a plotclock script, but because the servomotors are placed in a different configuration than intended the result is quite interesting.
The code is available from Codebender.cc