So that makes about $0.4 per piece. The LEGO set that was shown today costs about $0.12 per piece.Um most 3d printers do print in abs. A roll of abs plastic for an extruder printer could cost about $40 depending on the type of printer you have, you could probably print at least 100 or more Lego pieces depending on how you control your wall thicknesses and not waste material.