Dune3D is a relatively new 3D CAD for Linux. https://docs.dune3d.org/en/latest/ I haven't tried it, but it looks very promising.
Personally, I use FreeCAD, which is leagues better than it used to be, and improving quickly
I wouldn't recommend Blender for anything that needs to have accurate dimensions, as it is a pain to get things right, even with the "CAD" addon.
FreeCAD seems great, but the UI and UX are horrendous. It's a steep learning curve.
If you have any coding experience, I recommend giving OpenSCAD a look, like mentioned in another comment. I believe most of the older Prusa printer parts were designed on it.
Blender and FreeCAD.
Blender for organic, sculpted shapes.
FreeCAD for parametric, accurate parts.
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