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Initial prof of concept prototype created using a cam wheel like the kind you would find on a shopping cart.
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a printed rubber wheel on a paper clip
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prototypes testing various types of wheels using off the shelf markers
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Breakthrough! - First scaled prototype incorporating a cam wheel in a spinning housing.
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in exploration to create a ball point version, several mini soccer-ball like prototypes were created.
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More ball prototypes inspired by golf balls and geodesic domes.
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The evolution of dot pen prototypes
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Final working prototype
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close up of final prototype and its results
design iterations

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