A shim printed in TPU that removes the airgap between the the aerobar foot mount and the rails of my car (the gap whistles when moving).

This is a very niche part but if I save one other person from the blight of whistling aerobars I will be happy.

Recommend printing this in TPU as it relies on being squished a little to make sure it doesn't move but you could probably get away with doing it in PETG and scaling it down 3-5% but don't take my word for it.