I'd start with google. The basic steps are to export your model as an STL file, then read the STL file into Cura and slice it. youtube should be able to show you how to do those steps (export model as STL in archicad, and then how to slice a model in cura).
If you have an Ultimaker printer then I think that Ultimaker has some courses.
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GregValiant 1,357
Welcome to the forum. @Dustin of UM may know of classes for owners of UM machines. For the rest of us it's mostly "jump into the deep end" and sink or swim.
A couple of questions...
What printer(s) do you have access to?
What materials will you use for printing?
You will need to adjust the models for 3D printing. Simply scaling them down will cause features to "disappear" because they get too fine to print. You can see them in the model, but the line width of the printer simply can't be adjusted small enough to print them. Things like window mullions, small overhangs, landscape trees and bushes, supports for walkways, etc. don't lend themselves to 3D printing. My guess would be that making those sorts of adjustments was a big part of what your cohort was doing. You must think "fun scale" and not "exactly to scale".
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