Differential Hypocycloid

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forum thread: http://dev.forums.reprap.org/read.php?14,35968

video of CAD model (by triffid_hunter): http://www.youtube.com/v/bRn1K2XeWVE

blender model: File:Differential hypocycloid.blend

Hopefully this will be a solution for the too-fast-extruder dilemma.