It's really just a fancy hot glue gunI'm with Gary on this. how is the printer building the project? ( I don't get out much) is it injecting material as it goes, hot plastic?
Picture a simple object- say a pipe.
Stand that pipe on end
Slice it into 1/8" sections, so you get lots of thin rings
So that's what the software does- it takes an object, and slices it up into thin sections (more like .001" in reality)
Then, it tells the $2000 hot glue gun to spit out plastic to form that section
This is done via a simple two-axis horizontal thingamajig- moves left, right, forward, back
Then, once that layer is done, it moves up (z axis), and does the next layer...etc
You can make some really neat stuff with it!
For stuff with overhangs (imagine a pipe with an L-shape on top), it will automatically add removable supports