I saw two similar machines in use at Bosch on my tour of their facility here (see another post on the subject).
Kind of a misnomer to call them printers, but whatever.
The ones highlighted here create non-functional models, using plastic "wire". Bosch has one of these to create non-functional parts; models as it were.
They have another unit, costing well into the hundreds of thousands of dollars, that creates fully functional, structural parts that can be used. Instead of plastic wire it uses a specialized powdered plastic structural media, lays down a thin layer, and the high power laser in a CAT (tomography) process burns and solidifies the plastic. Onto the next layer... I saw some extremely complex casings and other parts, fully functional, made this way.
It takes about 6 hours to make a full complement of parts to the edges of the manufacturing envelope. They don't run the machine until they can "stack" the 3D burn envelope full, since it takes the same amount of time to make one part as it does a full complement of them...and they run it overnight.
Very cool stuff, but not cheap.