I thought this topic looked a bit lonely, so here's a contribution :
I have long been very frustrated by the above blade dust collection arrangement on my TS. The dust chute was supported by the riving knife, and to make this possible, the knife is quite a bit taller than the blade, so you have to take the knife off to use a crosscut sled etc. Taking it off involved undoing the two allen screws holding the insert, cranking the blade to the top of its travel to get at the bolts, undoing two bolts, removing the knife, then tightening the bolts back up so they dont wobble loose and fall into the sawdust etc etc. Needless to say, with all that hassle and the fact that I use a crosscut sled a lot, most of the time the riving knife sat in a drawer - not good...
The cure was spotted on-line : an overhead support for the dust chute which will enable me to cut down the riving knife to the same height as the blade. (It's not yet done so not shown in this pic).
The dust chute support is a wooden channel fixed to a joist above with a slider running in it that is clamped to the desired height with a toggle clamp. That also means it can be taken off completely if required. It's slightly to the right of the blade with the old dust chute temporarily screwed to it, that will allow tall work pieces such as cutting raised panels to pass to the left of the channel. Next job is a new dust chute in perspex for better visibility. I've also turned the old one around so that the vac is concentrated at the front where most of the dust seems to be thrown by the blade.
For the moment, the dust extraction tube still runs to the back of the TS where it meets up with the tube from below the table, but clearly it would be better to link it straight into the overhead tube to the extractor - as soon as Axi can supply some parts I'll change it over.
Dust collection seems very good, a little better than before, and I can leave the riving knife in place for almost all jobs !