Intro: Impossible 3D-printed Bolt and Nut
This 3D-printable file demonstrates a feature which can be used in 3D-printing. The nut and the bolt are separate parts of the same STL file. By leaving a small gap (roughly between 0,2 and 0,5 depending on your 3D printer and print settings) it is possible to let one object rest and adhere to another during 3D-printing, but still make it detachable.
See the video for details on how this nut was removed from the bolt.