Fusion table saw dust collector ports have a 4" on the outside port and 2.5" on the inside. I've modeled a plug (adapted from a McMaster-Carr part) for the little hole on the dust mount fitting. Best printed out of TPU.
Also, I'm currently not using the top of blade dust collection. I have no way to run the hose around my combo table saw/router/outfeed table. I've made a small PLA cap to cover that port.
I haven't tried either out to see how it impacts the dust collection but hope these help someone!
The author marked this model as their own original creation.