BIKE CHAIN SERVICE PULLEY

This pulley slides onto your 12mm thru-axle.
It allows you to clean the chain without getting runoff on the cassette and wheel.
It also prevents excess chain lube from getting on and into the cassette. 

I designed it in two parts so no supports would be necessary.
The parts should tighten together snugly without the need for glue, but feel free to glue them. 
There is no need to take it apart, once assembled.