Hello, guys! My name is Jim and I tell you about 3d printer. A 3D printer is a machine which prints 3d models. First of all, we have to design the 3d model in computer software like TinkerCAD. Then, we export the 3d model in a .stl file. We import this file in a curu computer program. We choose all the options and we save it as a .gcode file in an SD card. We put this card in the 3d printer and it prints the 3d model. The 3d printer is a very useful machine because it helps us to print very interesting things.