Attach a Numatic Henry 32mm vacuum hose to your dust extractor's 100mm inlet.100mm piece develops a lot of tension - my bent a bit out of shape during printing. Could be improved by adding cut-outs, but it's working ok, so I stopped at "good enough" state. Top part should be printed using 0.1mm or 0.2mm layers, for the threads to come out nicely. The 100mm plate must be sanded to fit really tight into the outer tube. I hammered mine in place (carefully), using a rubber mallet. Turned out it needed no gluing - friction was just high enough to hold both pieces firmly attached.