This thing is a simple hook that mounts with a single screw. It is designed for hooking into the back of a saddle to hang it underneath the ceiling. Please note that the bike I designed this for is very light, it is probably not suitable for a normal street bike. So be careful with print settings, material choice and so on. Minimum infill in my mind is 25% here. Also I added a rubber sleeve to prevent the hook from sliding out of position. This sleeve was not printed.