Very simplistically, it could be a bank of molecular-scale robotic arms with chemical binding sites on some arms, and grippers to hold components being built on another set of arms, all under the control of an outboard computer instructing it how to move to snap together the building blocks for the desired product.
(it; could be; a bank of molecular-scale robotic arms with chemical binding sites on some arms; T:Very simplistically) (chemical; binding; sites on some arms) (components; being built; L:on another set of arms) (an outboard computer; instructing; it; how to move to snap together the building blocks for the desired product)
it chemical components an outboard computer
could be binding being built instructing
a bank of molecular-scale robotic arms with chemical binding sites on some arms T:Very simplistically
sites on some arms
L:on another set of arms
it how to move to snap together the building blocks for the desired product