I already designed the non-vented JessEm Compatible Ring Inserts for Router Lifts so I was asked to make them vented so people could use them with their downdraft router table. So I did. They should be completely compatible, just as the non-vented ones are, since I used those models and did not modify any geometry that interfaces with the router rings.

And as with all my designs, if you have any comments or suggestions to make it better, or if you run into an issue, please let me know so I can address it. I really do like my designs to work well, and if they do not, I want to do what I can to remedy that.