Anyone with Thule WingBar will know how important the little filler pieces are to stop whistling.
So when I needed to replace the lower cover strips on second hand Thule WingBars. Rather than purchasing replacements decided to 3D print them.
Printing instructions
I printed these with PETG in vase mode 0.2mm layer and no Solid bottom layer.
Adjust the Z height to match the length required.
Note: As its vase mode they will need to be printed separately.
The author hasn't provided the model origin yet.