How do I install build ups?

  • 3D Printer Model:
  • Slicer:
  • Hardware Setup:
  • Problem description: I have an stl file of a building our architect provided and it looks pretty good overall, but it’s a shell, meaning there is nothing in the middle, so nothing ot support the flat roof structure, and I can’t figure out how to ensuer that I get some kind of build ups to support it during printing.

I don’t really want a SOLID structure, but stumped on how to do this.

  • What I tried: