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DIY Autopen Answered

An interesting Instructable would be for a DIY autopen.  It isn't the most practical thing--anybody who really needs one probably has the resources to purchase a real one.  But it would be kind of cool, and it seems like it should be a fairly simple machine. 

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caitlinsdad (author)2012-05-09

Interesting device, line-follower inkbot in reverse.

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