Evil Mad Scientist Labs sell a bunch of cool open source hardware kits for making plotters -- basically, a very precise robot arm that draws with whatever pen or marker you screw into its grip. There's the Eggbot (for drawing on curved surfaces like eggs, balloons and balls), but there's also the Axidraw, which works on flat surfaces.
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Jason Allemann of JK Brickworks (previously documents his latest creation: a poltter that squeezes precise patters of icing onto cookies, built out of Lego Mindstorms, and includes full, downloadable instructions.
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Digital media artists Makio&Floz use their AxiDraw drawing machine, which they have dubbed "Jojo le robot," to create plotted portraits. They are currently offering these signed and numbered "Plottraits" to the first 100 people who order.
About "Jojo," in the artists' words (translated from French):
Jojo, disciple of the greatest masters of his time, underwent a rigorous and intense training.
He attaches an extreme importance to the quality of his line, but also to the quality of his material. As a result, the paper used has been specially selected for its grain and its particularity to put forward the work by offering a contrast between shadow and optimal light.
Calibrated felts were also chosen for their finesse and the durability of the works.
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The Mug Marker is a Don McRae's cardboard mug-decorating robot that uses an Eggbot-style EBB controller board and stepper motors to draw precise patterns on your favorite coffee-mug. Lenore from Evil Mad Scientists has a writeup on the design process and the way it performs. Read the rest