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I'm not a 3D expert, but I think for functional components, you probably want to use a CAD software. There are several options: the easiest is probably Tinkercad - it's like playing with clay. Or you can go with the fully parametric ones like FreeCAD (open source) or Fusion360 (there is a free community license but with some inconvenience).Blender is usually for more organic shapes (think of anime characters).
I'm not a 3D expert, but I think for functional components, you probably want to use a CAD software. There are several options: the easiest is probably Tinkercad - it's like playing with clay. Or you can go with the fully parametric ones like FreeCAD (open source) or Fusion360 (there is a free community license but with some inconvenience).
Blender is usually for more organic shapes (think of anime characters).
