I designed this simple wall mount rack for my bicycle. Showing in the pictures I have not mount on the wall, I just temporarily put on the metal pole. As you can see the wall mount there are two holes for you to put the wall plug screws.
Attached are two STL files, modify as you like. For highest strength, print the hanger.stl flat and print the wall mount on vertical as shown in the picture.
Happy 3D printing..... :)