If you use SketchUp, this is the holy grail. It is user-generated content, meaning quality varies, but the sheer volume is unmatched.
Before diving into the download links, let’s understand why partitions are a staple in 3D libraries. partition 3d model free download
If you need (gears, tools, engines): Go to GrabCAD . If you need vehicles or furniture : Go to Open3DModel . If you need game characters : Go to BlenderKit (filter by Collection). If you use SketchUp, this is the holy grail