This is a cover for the 90 degree versaplanetary drive kit from Vex Robotics. I designed and printed this to cover the exposed bevel gears. The case slides on from the side and then there are holes so you can put a bolt in and secure it. You only need one bolt to keep it from falling off.
I recommend printing in the orientation in the pictures with support enabled.
I posted the sldprt as well as the stl in case you want to modify the design at all