I just learned this and its awesome.
You can insert a pause at any point in a print and use that to install an item into your print like a nut or bearing.
How to with Prusa Slicer:https://help.prusa3d.com/article/insert-pause-or-custom-g-code-at-layer_120490
Here's a video to give people ideas. You don't need the fancy software or printer they mention a Prusa will work just fine:
Link to You Tube
Lots of possibilities there.