I'm thinking about geting a festool CT MIDI dust extracter. I need some clarification. Will the Oneida Dust Deputy. Actually fit on it? Not just set but Click or Lock into place like a normal systainer box would?

Wild Bill, The Oneida Dust Deputy will fit the older models of the Mini and Midi and we also just tested it on the new 2019 Midi and Mini and it also fits. Also, it does latch to the top of the extractors.