Unfortunately ArchiCAD does not have a STEP export option. What other format would you recommend?
Sorry, STEP and STL are the only ones I’m familiar with for solids export. IGES went by the wayside years ago (wireframe era for me…) What are your options?
OK so the only real solution is to fix it in ArchiCAD before exporting. Do you or anyone else know what specifically causes these unconnected points when exporting from ArchiCAD? Is it a setting in the export dialog, or is it how the elements are modeled inside ArchiCAD? I want to understand what I am doing wrong so I can fix it at the source.
.STL - StereoLithography File 
I don’t know what file formats Sketchup and Rhino use, but they are at least 3D modelers and their file types might be in the import list in Studio:
If you try outputting with those types, you can see what their file extensions are… Sorry, I’m just spitballing here becuase I’m at work behind a powerful firewall…
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You might be able to get a stable output from it if you use an intermediate tool. If archicad makes a valid model when outputting to SketchUp format, you can then just import and make sketchup export an stl, maybe more faithfully
Yes, moisture can frequently lead to stringing but it needs to be pretty soaked. Before that come changes to the materials heating and cooling down behavior so it is also linked to warping, curling and heat creep.
As for the supports, I am afraid that this is a tricky case.
You’ll need supports on the inside of the part. So they’ll need to sit on the model’s basement and 1st floor to support the roof.
When I tried something similar 18 months ago (or was it 30? Time’s a blur…), bug’s in Studio prevented a good support base on the model.
Nowadays, I’d probably try with a 3 layer PETG or even BVOH support interface (for the final prints).
But I’d expect trouble (support base slicing and support removal) and an interesting iterative learning curve.
These changes would probably come close to my first trial:
But I can already see a few potential issues:
Sinks where the landscape meets the house (getting the support interface out)
The floor not being perfectly level (risk of support curling, early detachment)
Areas where support is near impossible to reach
Or near unreachable and unretractable
So yeah, think about whether you need to have the space behind the stairs to be supported of if you can just fill it with a block, which key views are important and which you can simplify or even close up, keep the floor as straight as possible (tricky with landscape of course).
You may even want to get especially creative in the staircase and the open space in the 1st floor by placing two sacrifical cube primitives to break up the supports there for easier removal. They should not actually touch the model itself. Just help to break the supports.
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