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If you need something a little more advanced, check out [https://www.autodesk.ca/en/products/fusion-360 Fusion 360] ([https://www.autodesk.ca/en/products/fusion-360/students-teachers-educators free for students. teachers, and educators]).

TinkerCAD is nice for smaller parts with very little complexity. However, since it is not [https://en.wikipedia.org/wiki/Non-uniform_rational_B-spline NURBS] based nor parametric, it lacks major functionality. It is strongly suggested at this stage that TinkerCAD, Blender, Cinema 4D or other [https://en.wikipedia.org/wiki/Polygonal_modeling polygonal modelling] (non-NURBS) applications be set aside for parametric CAD software, such as [https://www.autodesk.ca/en/products/fusion-360 Autodesk Fusion 360] ([https://www.autodesk.ca/en/products/fusion-360/students-teachers-educators free for students. teachers, and educators]), [https://www.solidworks.com/ Dassault Systèmes Solidworks] (available through Remote Apps) or [https://www.onshape.com/en/ PTC OnShape] (completely online, free for students and educators) be used for mechanical design, as models made with such software contain much richer data that allows going from CAD models to manufacturing data.