Thanks, I enjoyed that. There is a well established technology that is
currently used for the production of expanded poly styrene parts (Styrofoam)
that mimics popcorn. Pellets of styrene are impregnated with a propellant
(pentane), and are then expanded by heating (usually with steam). Shape is
determined by constraining the pellets in a mold, causing fusing at the
expanded cell borders of the hot plastic. Wonder where that might go for
fabbing large Styrofoam parts?
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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