Fractal growth speedup limit
When Building a solid structure without voids with the components of the productive nanosystem (deprecated assemblers or nanofactory grains) dispersed thorough a whole sccaffold those p.nanosystem componends need to be removed through a tree like structure. When the Block is almost finished the tree channels get thinner and thinner up to a point where the process becomes slower than the building process would be with a "conventional" layer of a 2D nanofactory. If the average process speed increases is an non trivial question to investigate when we have enough information to do so.
(TODO: add illustration from paper sketch notes)