One of the projects I did during the MIE243 Mechanical Engineering Design course was to design a 3D printed right-angle gearbox with the input and output axes offset, but without using a worm gear. The target speed ratio for this gearbox is a 3:1 reduction, and would be operated using a hand drill. This project taught me a lot about designing for 3D printing. For example, one thing I learned about 3D printing is that plastic is a lot stronger than I initially thought. At first, I expected that parts would just snap or break with minimal load or torque. However, that never happened. This project also taught me about the importance of having keys and other alignment components. In the first iteration of our gearbox, there was no key. This meant that the gears would not spin with the shaft. However, after adding a key, the gears perfectly spun along when the input shaft was rotated. For our final design, we used helical gears in a 3:1 ratio, with a housing that involved dovetail joints for more stability. Furthermore, we made an instruction manual in the form of a LEGO set instructions manual, to make it easier for the TA’s to assemble our gearbox.