I’ve been using my TrimBin since I got it for dry sifting as well, did up the shake from last grow on my unheated but enclosed porch last night at -5°F. The 150 micron screen works just fine for a general ungraded kif, and as long as I use well-cured and bone dry shake at a significant subfreezing temperature, I’ve had excellent results with minimal effort. This time around the shake was two BLR x GSD F5 testers, along with a Cherry Unicorn and a Gorilla Bubble. I put a gallon of it on a half sheet tray, let it freeze and dry for twelve hours, then crushed it up to a fine almost powder with my hand and sifted it through the screen into the bottom of the bin. Usually I just shake and smack the edge with my palm but this time I used my Opove percussion massager (knockoff Theragun for $100, they’re fucking amazing) and that worked so good I’ll always do that from now on. I got a fantastic yield of perfect golden kif from the vibration instead of working the plant material through with my hands. AFAIK the key to dry sift is a good long cure, real dry weed, and very cold temps to do it in. Winter is my dry sift season now, but I imagine it would work just fine straight out of a chest freezer too.