For some reason, Dubia Roaches have been smart enough to climb up the small chain that attaches my arboreal feeder to the top of the cage, but I designed a top that would discourage the roaches from escaping when climbing up the tower feeder portion. Tested for several weeks, they don't seem to even attmept to climb on the “roof” portion. Just fit on top of the tower feeder and feed the chain through the hole.
Can be printed with any filament, no support, no brim.