I tired the https://www.printables.com/model/1392189-oxo-rapid-brewer-cup-adapter and didn't like how the coffee sometimes dripped onto the printed part, also it was too big for some of my cups.
I measured the AeroPress cup adaptor and modeled something similar for the OXO
if doesn't fit snug try resizing by 1%-2%
I printed in natural (uncolored) PLA with the hopes that it's the most food-safe option (the coffee doesn't touch the printed part anyway...)
The author marked this model as their own original creation.