How is that support supposed to be laid down? It can't sustain itself in thin air any better than any other hot plastic Sure, if the support was put in place first in a proper, brick-like manner, then an overarching sheet of material could be laid down on top of it, and the printer could move in Z as it's doing that. That would require a different sort of coding than the current Slice3r does, but it wouldn't be a problem for the machine itself, unless the vertical curves in the model were too extreme for the extruder nozzle to get close enough to deposit effectively. Most current FDM-type machines have been designed for flat extrusion, but a needle-like nozzle could conceivably be designed that would permit this sort of thing.

Andrew Werby
www.computersculpture.com