If you think about it, STL files are like PDF files. You usually create them using some other program, export them, and then expect them to print. But you rarely do serious editing on a PDF or an STL.
What do you get when you cross a day job as a Medical Histopathologist with an interest in 3D printing and programming? You get a fully-baked Open Source microscope ...
FreeCAD isn’t the flashiest option, and I wouldn’t describe it as the most beginner-friendly path on day one.