WLtoys A959, A969, A979 A959-14 Differential Cups

thingiverse

I've found these units to be quite effective, but their strength is somewhat limited, making them more suitable as temporary substitutes only. However, if printed with nylon, they could potentially prove more durable. I opted for the aluminum model initially, but have come to appreciate these alternatives due to their ability to function like a protective fuse that safeguards the rest of the system in case a wheel becomes jammed by an obstruction. They also print quickly and at a relatively low cost.