The initial bikeclip was working well, but months of torture on kreuzberge & neuköllns cobblestone roads seem to have weakened the pla and it started to fall of sometimes.
This improved design sticks so good that it's an antitheft solution as well. Make sure to meassure your dimensions. I figured out that tolerances are quite high. You can download the rhino source file here for easy editing: data.bza.biz/bikeclip002.3dm