> lithography process for every layer It's not. They are similar process steps, deposition, etching, etc but they are applied at once to long deep holes and o

> lithography process for every layer It's not. They are similar process steps, deposition, etching, etc but they are applied at once to long deep holes and other staircases that intersect the many layers. The layer is an insulator or conductor (etc) which intersects an entire plane of these tubes. Equals one planar wire which addresses one whole plane of tube intersections. So that's one of the problems in there: similar operations but applied in grossly different circumstances, but lots of unknowns and different ideas being thrown at the wall. And that's one of the opportunities: it's hard to tell how long this will work. Like, how many years of scaling this will produce.