This is a joint handson course for Taiwan Tech and Tokyo Tech students. The students were asked to design their owned 3D printers and to implement their designs by using commercial 3D printers, i.e., 3D printing a 3D printer. The students first learnt a series of specific knowledge and technical skills about 3D printing and printing machines. They were then motivated to transform what they learnt to build up their owned 3D printers. This video shows the printing of a 3D printer which was made by a student team.