One alternate imagining of the current tower idea which rises from the ground, is to have the tower growing downwards instead.
There are several logistical benefits to doing things this way. Gravity can ease the growth of the tower rather than hinder it.
The lowest parts of the tower are created first, and so sprout first. New layers of each tower are added at the top, closest to the ceiling. The printhead doesnt move vertically it only marks out a 360 circumference.
One diagram shows an idea to create multiple hanging towers. People can walk through these descending towers.
The tower is lowered as it is created.