The free online course How To Use A 3D Printer introduces you to the hardware and software technology behind 3D printing. The course begins by introducing you to the hardware used in 3D printing. You will learn about the different plastic filaments that are used and you will pick up tips on how to feed the plastic filament into the 3D printer for optimal performance. You will learn about the different components of a 3D printer such as the extruder nozzle and contact sensor and their functions. You will then learn how to set up and calibrate a 3D printer so that the object is printed correctly on the printer base plate. You will learn about different 3D print software that can be used to design 3D objects and the importance of using 3D model repair to eliminate errors in the design that can cause defects in the printed object. This course will be of great interest to professionals in the areas of engineering, design and manufacturing who would like to learn more about 3D printing and its applications. It will also be of interest to all learners who would like to learn more about 3D printing and the future applications of this exciting technology.