In my past I often made fem analysis to check if my designs would hold the expected forces.
Somtimes i made analysis just during work but often i also made reports to convince the client that the designs were up to expectations
3D printing is easy.
Making 3D print designs is not.
just when 3D printers started to become a thing i tried the first ones. they worked awful. later they became more usefull and then aplications started comming. mostley i used this technique for special tooling for workshops.