Building a Drawbot With LEGO : 6 Steps (with Pictures) - Instructables
Easy LEGO Mindstorms Spirograph - Christoph Bartneck, Ph.D.
Making Spirographs With LEGO And Math | Hackaday
Spirograph PV-Productions - 42055 C Model | Master builder Chris van de Kam (NL) upgraded our Spirograph build during the Holidays and included a EV3 to the party. Now even more unique
Making Spirographs With LEGO And Math | Hackaday
LEGO MOC Mindstorms Spirograph Robot by bartneck | Rebrickable - Build with LEGO
Two small DIY LEGO Technic spirographs | The Kid Should See This
Overview | Crickit Harmonic Drawing Machine | Adafruit Learning System
Spirograph Automaton made with LEGO Mindstorms EV3 - Christoph Bartneck, Ph.D.