I just can't see how I'd have the time to actually develop the skills to use them effectively.
John if I, a former structural engineer and lawyer can design and build a circuit board .....you can design a 3D object.
I started with TINKERCAD an easy free 3D modeling program. Modeling is just putting together 3D shapes like squares ,rectangular boxes spheres or cylinders to resemble your model then subtracting holes or parts you don't want.
You clearly understand that Printing is just converting your model to a .STL file that is read by a slicer program that creates vertical slices that the printer prints in steps.
It really is not that hard to do or I couldn't do it either.