SOL75 is described as 'A library of functional 3D models and a customizer to get components that fit your needs. With mechanical expertise at its core, it allows anyone to easily get custom, working parts, to 3D print' and is a 3D Printing tool in the system & hardware category. There are six alternatives to SOL75, not only websites but also apps for a variety of platforms, including Android, iPhone, Android Tablet and iPad apps. The best SOL75 alternative is Thingiverse, which is free. Other great sites and apps similar to SOL75 are Ultra Librarian, GrabCAD, MyMiniFactory and Traceparts.