ToyBuidler Labs has some samples of the product that we are testing right now. It is not nylon, but is a different compound that can work over a much wider temperature range to help purge the system between different filament types. It may help in some cases when there is "overcooked" filament in the nozzle -- but if the particles are too big, you would still need to clean out the big chunks by retracting filament back out the cold-end side.