What's a good way to turn my finished compost into a uniformly sized particles, making it a more presentable product to sell? I've tried chipper/shredders but they immediately clog up due to moisture in the compost. Those pass-through leaf mulchers with plastic strings work better, but throw bits up out of the top and eventually build up on the inside. I haven't tried a motorized sifter and don't know a good place to get one. Something akin to an oversized sausage grinder may do the job if such exists.
I use coffee grounds, fresh grass clippings and leaf mulch plus garden refuse in my two motorized composters which, along with three palletted compost piles in the back, produce more compost than I can use.