This is a tyre washer used to clean up the tyres when you come off the track after a run and can just drop in a tyre in the washer and spin it up using a cordless drill while it's still attached to the car, repeat for each corner.
Once you've cleaned the tyre just dry it off on some microfiber or shop towel and go to the next one.
It requireds a 50x50mm (2"x2") square brush to be mounted in the slot, I just picked up a bigger one and cut it down to side on a band saw, or else can use a hand saw.
Depending on your printer and filament you might need to make sure you print with at least 4 layers top and bottom to try and make it water tight so the cleaning liquid doesn't drain out before you are finished cleaning.
I usually clean 1 car then dump the cleaning fluid and fill it up again before using it again.
The author hasn't provided the model origin yet.