Categories goatee-stroking musing, or something or two Solar Marble Machines, at normal speed! Post author By scruss Post date 02014-07-06 No Comments on or two Solar Marble Machines, at normal speed! Related posts: Solar Marble Machine at 2× speed Tags marble, solar, solarbotics, solarengine ← Solar Marble Machine at 2× speed → File under “Partial Successes” Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment Name * Email * Website