Nice article, though what I'd personally love to see is a resource where I can go from zero to actually making (basic) designs using open source tools, which can then be taken to a 3D printer and printed.
The learning curve was steep, but FreeCAD has allowed me to start playing with 3d printing gears and other things on my Bambu Lab P1S. I'm largely self taught with electronics and programming, so just starting and making small experiments got me going. For inspiration, there are lots of sites that share 3d print designs.
Would you say Blender is a nice tool for this purpose? I'd much rather learn one graphical tool which does a lot of different stuff than lots of different graphical tools that do different specific things (it's a different story in the terminal though :))