The die size of the Cell processor at 90 nm features was 221 mm**2. Therefore, the 45nm die size should be about 55-70 mm**2.
So a perfect wafer would have about 300 cell processors at 90nm and would have 1000 cell processors at 45nm.
Semiconductor plants produce about 50,000 wafers per month at maximum production. But plants can be in the 15000-20000 range as well
These plants cost about $3 billion each.
Advanced printable electronics or nanofactories would need to have those levels of productions given similar investments. $3 million printable electronic machines could each produce only 60 wafers (18,000 200 mm**2 die size ships) per month with similar performance chips and they would be competitive with current semiconductor fabrication.