It depends on the wheel you use them with. My 3d printed wheels are thinner than any standard wheel where the axle comes through so I have quite a bit more thread showing than I did with they alloys I tried or the stock traxxas wheels.
The powerhobby ones are cool, I think a couple other companies make them too.
I was going to buy some before I got my printer then found a free .stl and printed them.
Mine look good from a couple feet away. I painted them with paint parkers and as I was finishing them up my wife came in and...