I wouldn't discount Avi Reichental's prediction so fast. Yes physics gets in the way now, as plastic needs time to melt, extrude and harden in filament printers. That's if you look at current technology which maxes out at 4 extruder heads now. What if HP figures out a way to atomize the plastic and spray it through a 14,000 nozzle extruders like in their wide format printers? Or what if a nozzle array was wide enough that it didn't have to move on one axis like the HP inkjet with no moving print head? SLA took a huge jump with the Form 1 and speeds could certainly increase with laser arrays to melt the substrate. Double the speed at half the price in 2 years... totally possible.