On his conventional fused deposition modeling (FDM) printer, Peters replaced its plastic extrusion system, or print head, with an air-pressure nozzle that delivers a homemade liquid clay mixture stored in reusable plastic cartridges. Layer by layer, a brick emerges from a linear bead. Each brick takes about 15 to 20 minutes to print, a day to air dry, and then 12 hours to fire in a kiln at roughly 2,000 F. To date, Peters has designed and printed four types of bricks: honeycomb, interlocking, ribbed, and x-bricks. Like all craftsmen, he continues to finesse his work to account for the performance of the material in reality.
quoted from:
http://www.architectmagazine.com/technology/award-buildingbytes_o.aspx
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