This is the second PLA rocket I am building. The first one flew well and is ready for another flight. See it here. The bottom section of this rocket is 300mm tall. I will print a 300mm tube and a 70mm nose cone for a total height of 670mm.
The layer alignment on this section is the best I have ever seen on any of the printers I have built. I was worried about issues surfacing as I printed at higher and higher elevations. So far I have not had any. This one was printed at 0.35mm layer height and took about 2 hours to print.
I measured the Z height again and I can print 390mm high.