BMW airhead indicator lens gasket
thingiverse
My 1979 BMW r65 was missing the gaskets from the indicator lenses so I modelled and printed some replacements using black ninja-flex TPU. It took a couple of iterations to arrive at something that fitted well and was flush with the outside of the lens. Maybe fit it with the faces smeared with a bit of petroleum jelly or wax polish if you want it to be watertight, but I didn't bother. The lenses have a slot for draining water out the bottom anyhow. ABS would probably work fine also but you may need to scale it up slightly to make it fit. The TPU material has a bit of stretch to it and is a nice tight fit.
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