3D printing or additive manufacturing is the construction of a three-dimensional object from a CAD model or a digital 3D model. It can be done in a variety of processes in which material is deposited, joined or solidified under computer control,[4] with the material being added together (such as plastics, liquids or powder grains being fused), typically layer by layer.Scratch is the world's largest coding community for children and a coding language with a simple visual interface that allows young people to create digital stories, games, and animations. Scratch is designed, developed, and moderated by the Scratch Foundation, a nonprofit organization.
https://en.wikipedia.org/wiki/3D_printing

Instructors can use this technology to customize robots to be applied in the classroom. The use of different tools, based in 3d printed prototypes, promotes the enhancement of the adaptation to different scenarios by the students.