Alchomite Stack Dome for your Official Sector Mechanicus Scenery or theavatar111 things (like https://www.thingiverse.com/thing:2991954 or https://www.thingiverse.com/thing:3020503).
I made this after a year hoarding Sector Mechanicus parts and find that I only have one dome.
If some other orientation is required I will gladly cut the model as requested.
UPDATE: I´ve uploaded a new version of the top piece. After test printing it I found several problems with Simplify3D and Cura, so I repaired it. Also enlarged some features in order to not require sub-0.1 layer heights.
Also removed the full assembly as the split versions is OK and if someone wants to print this I recommend to print first the upper top piece.