If you like the astronomy you will be able to print, for example, asteroid mockups with a great precission, satellite replicas, telescopes, craters, and robots as the popular one 'Curiosity'. The 'National Aeronautics and Space Administration' publishes multitude of free STL files to download. You can find amazing projects as robotic arms, airsoft replicas and drones.

This website is focused on mechanic technical projects. The claim: 'GrabCAD is the hub for digital manufacturing'. It is outstanding how well documented are these projects, with step by step instructions. It is a great option for advanced users looking for something more. It is a website where we can find not only STL models to print, but we can find or share any DIY project, as 3D printing projects, milling, laser cutting, etc. It has a wide catalog of STL model files and high quality designs. It is worth visiting, without any doubt. It is a repository of 3D models property of Ultimaker, where any user can share their 3D designs with the rest of the community. This website is property of MakerBot Industries, that since September 2012 has stopped sharing the design of their products, since then their hardware was open source. It has a great community of users that offers plenty of designs of different categories. Maybe one of the most popuñar websites to download models. Here you have a list of the main websites where you can find high quality models ready to be 3D printed at the moment. Are you looking for free STL models to download and print them with your 3D printer? One of the characteristics of this technology is that everything is shared, and largely for free.

3d print stl files free download