An amazing centre piece for any tabletop board game!
Defence line is from MKHand, their libraries are well worth a look on Cults3D.
https://cults3d.com/en/3d-model/game/interstellar-army-defence-lines
Greebles came from RobertusMaximus @RobertusMaximus on printables.com.
https://www.printables.com/model/153793-greebles-entry-panel-hatches-and-more
https://www.printables.com/model/154380-greebles-part-2-lights-power-units-vents-ladder-co
Printed this and the it came out well, needs a 300mm wide bed and 400mm tall to print off full size. Remember if you scale it too much it may not fit well with 28mm minatures.
EDIT: Oh I forgot to say the model can be split in something like Meshmixer into even smaller parts for printing.
The models in the photo are 28mm space marines due scale.
The author remixed this model.
Remixed the Planetary Defence Laser by asciencepotato for use with 28mm. Removed doors and hatches that were about 11mm scale and added a few touches so the laser didn't look so lonely!