Pretty much as it says on the title. This is for mounting a commonly used motor at 45 degrees. After prototyping the small robot in the video in cardboard & tape I modeled this for the same kind of application. For those interested, the wheels are made from mdf cut in the laser cutter. For grip to the motor shaft and on the rim, I used heatshrink. https://www.youtube.com/watch?v=2l_T8-bIVucIt's about a 40 minute print.