Seems they all come with an insert wide enough for a 3/4" dado blade. Filling that gap may help with dust, but it certainly helps with cut quality. The first one I made was years ago, and the blade also needed refreshed, or replaced, and without doing that I noted much cleaner edges on all the cuts after putting in the insert than I was getting before.

Hardest part of the entire process is getting stock to the correct thickness. Once you have that using the insert as your template makes it quick work. Worth the benefit IMHO.

Question for all? Is anyone else using the dust ports from Shop Nation? I bought one right before I got sick for my new to me Metabo 12", but really haven't gotten much chance to use it since. Anyhow I was wondering what everyone thought about them. They seem to average about 50 bux, which would be peanuts to get rid of the dust mountain those things can produce, at least this was my thought back when I bought mine.