Controlling dust in a woodshop is always an issue. The bag collector included with the Porter-Cable PC60THP planer does only a moderate job of collecting the sawdust and chips produced by the planer. Replacing the dust bag with this fitting allows connection to my shop vacuum and largely eliminates the problem. The exit port of my planer is 41mm in diameter and my vac hose is 57.5mm. If yours differs, you can adjust via the OpenScad file.
The author hasn't provided the model origin yet.