This is something that has bugged me for quite some time but until just recently I put up with it. I'm sure a lot of you have experienced dumping dust out of the hose when unhooking the hose from the dust collector. IMO the hose end on the 27mm needs a slight modification by Festool to eliminate this issue but it's something you can make some improvement to after just a few minutes. I got in the habit of putting the vac in manual and pulling the hose loose but keeping it near the vac suction and tapping it onto the ct to break the dust loose and let it get sucked into the vac.
You should be able to see from the pics below that the issue is with the 27mm hose end there is a pretty large recessed area that just attacts and retains the dust. When you cut panels such as MDF (just one cut) this area will fill up and fall out of the hose once you disconnect it. I just used some 5 minute west system expoxy to fill that gap and most of the problem is gone. The 36mm hose does not have this recess so nothing mentionable collects on the 36mm hose connection. There is still a dead zone created because the hose is so much small than the fitting and ideally this should be tapered from the small hose to the big outlet and no dust would collect.
Just a simple quick mod to prevent some of this stuff from getting on the ground...
