If you own an offroad RC, you may notice that your tires stick out farther than your wheel... this would become an issue if you are trying to find a flat surface to measure camber, toe or ther alignment. You will want setup wheels for that!
This part goes along with these sets of
setup wheels.
These hubs are designed for 12mm hex wheel adapter with standard length axle. For example this fits on a Team Associated B5M front axle.
For long length axle, you can get the hub adapter
here.
Since this is a 3D printed part, there may be some final rework required such as filing, drilling, or tapping in order to get the perfect fit.