Basically a base in space but you have to use the 3d printer to make a space hub (1 titanium 1 copper) and take it out into space using a space shuttle or ship and place it thus being able to build space station parts using a part builder (2 titanium) which can be used to build hallways and buildings (smelter research e.c.t) the hallway recipes could be
Straight = 1 titanium
Turn = 2 titanium
Building = 2 resin plus the building craft cost
The reason I chose titanium as my main resource here is because I'm normally stuck with lots of it and it gets quite annoying.
Thank you for reading my idea!