The addition of embedded nuts on other layers involves design effort. A secondary part is required. As an example, I want to embed a hex nut into my part as shown in the cross section below with its axis parallel to the building board. (A square nut would be the simplest solution here, as it would provide a flat surface for printing). If I leave the cavity as shown, support material to be removed is necessary.
I could build an angled overhang into the cavity. But now I still can’t use any supporting material and furthermore the nut is not tight, but would twist when tightening a screw in the cavity.
Instead, I can add a secondary part to the print, which secures the nut and gives the printer a flat top for printing. To do this, I create a recess with a flat top for the nut:
Design a small part that fills the remaining space in the cavity. Take the tolerances into account here as well.
This can be printed next to the main component, so I can insert it during the interruption with the nut, and continue printing on the flat top of the secondary component, as with the angled square nut below.
You can also use the same method to embed nuts at other angles, you just need enough space to place them. The small rectangular piece in the cross-sectional view below secures a square nut crosswise in the printed part:
With this technique, nuts can be installed in 3D-printed parts at any angle and on any layer. But you do not have to limit yourself to nuts. Try out how you can best use nuts or other components and let us know your results.