This is a simple functional 3D printable pulley that can be used for learning applications or another small project that requires pulleys. This pulley can spined and does not need much additional hardware. Please note you will need to buy a ( 2mm nail). For detail on how this simple project goes together, take a look at the pictures provided, or more instructions can be found at https://3dprojectsfortomorrow.com/mechanical-inst-page-2