I created this robo vac adaptor to make emptying my robo rock (Xiaomi) dust collector canister much cleaner and easier. There is no dust flying around, as it's all sucked into the Dyson. I created the adaptor to connect to Velo17 Dyson V7 V8 V10 universal 34mm adapter https://www.thingiverse.com/thing:4141125 as I have a Dyson V10 and a V7

My version of adaptor has lugs on the interface to lock the dust canister to the adaptor so that it can be emptied using one hand, and is less likely to separate while emptying

The additional benefit of using this method is that it sucks the air back through the canister filter, much like back flushing a pool filter, which will extend the filters life.

If you are using a V7 I suggest cleaning the canister before it is full, as the V7 has difficulty moving a large ball fluff in a single shot