How Does a Retractable Pen Work?


By , 11/24/2015 @ 6:02 pm= | Full size is 1768 × 720 pixels

Jeremy is an engineer with 10 years experience at his full-time profession, and has a BSME from Clemson University. Outside of work he’s an avid maker and experimenter, building anything that comes into his mind!

Jeremy Cook on Twitter

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