If you are using CAD software like or Autodesk Inventor , you can generate a solid piece using these standard methods: 1. Extruded Boss/Base
You can save a multi-part assembly as a single part file, which can combine separate bodies into one. 4. 3D Printing Context 123448
Use this for cylindrical or circular parts (like a wheel or a shaft). If you are using CAD software like or
If you are preparing a model for , generating a "solid" piece often means: 123448
This is the most common method. You draw a 2D profile (sketch) and "pull" it into a 3D shape.