Are you an aspiring designer or engineer looking for free CAD models to use in your projects? Look no further! There are many websites and resources that offer a wide variety of CAD models for free. Whether you're into 3D printing, product design, or architecture, these sites have something for everyone.

1. Thingiverse: Thingiverse is a popular website for designers and makers to share their 3D printable designs. You can find a plethora of CAD models for various purposes, from functional objects to artistic creations.

2. GrabCAD: GrabCAD is a community of engineers and designers who share and collaborate on CAD models. You can find a vast library of free models, as well as join challenges and competitions to showcase your design skills.

3. Free3D: Free3D offers a collection of high-quality 3D models, including CAD models, for free download. You can explore categories such as vehicles, characters, and architecture to find the perfect model for your project.

4. 3D Warehouse: 3D Warehouse is a platform by SketchUp where users can share and download 3D models for use in their SketchUp projects. It's a great resource for architectural and interior design models.

5. Yeggi: Yeggi is a search engine for 3D printable models, including CAD files. You can use Yeggi to search through multiple 3D printing platforms and find the perfect model for your needs.

6. Cults 3D: Cults 3D is a marketplace for designers to sell or share their 3D models. They also offer a selection of free CAD models for those who are looking for quality designs without breaking the bank.

7. MyMiniFactory: MyMiniFactory is a platform that offers a curated selection of free and premium 3D printable models, including CAD designs. You can find models for gaming, cosplay, and more.

8. Autodesk Online Gallery: Autodesk offers a free online gallery where users can explore and download 2D and 3D files created with Autodesk software. It's a great place to find professional-grade CAD models for your projects.

So, whether you're a student, hobbyist, or professional, there are plenty of options for finding free CAD models online. Just remember to check the licensing requirements for each model, as some may have specific terms for use. With these resources at your fingertips, you can take your design and engineering projects to the next level without breaking the bank!