This is cap that is meant to shield the belt pulley bearings from dust and moisture on the BMW M60 engines. I added the notches so that pliers could be used to remove the cap when needed.
Original part number: 11281727159
Print in TPU for it's exceptional layer adhesion. I used Overture High Speed TPU and the fitment was good, I don't think they will fly off. The originals were long gone.
The author marked this model as their own original creation.