I have designed a simple tube to use with Festool CTL MIDI shop vac bags. Just take your single-use dust bag cut at the end to open up a bag, empty all dust if any and use a printed tube clip you can use a separate part triangle strip to roll the end of the dust bag for easier tube insertion. I have tested on my own Festool CTL MIDI works perfectly with no issues so far.  Print settings: PLA+ green, layer height 0.15mm speed 60mm/s infill 100%  tube print orientation vertical. Triangle strip print orientation flat on the print bed on any side.