Jet Dust Collector Reducer

The manual for the Jet Proshop II table saw says it has a standard 4" dust collection port but the outside dimension is 3.85" (98mm ) and inside dimension even smaller so my standard hose adapter didn't fit. I suspect one of these is less standard than the other.

Anyway, printing a few test rings helped me to zero in on the right dimensions for the large and small hose fittings so that the completed adapter snug-fits securely without any band clamps. So far, at least. Whether it expands over time, and if so by how much, remains to be seen.

I printed this in PETG with no supports in about 9 hours.

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/dJfeA4LxClV