Makita 2012NB planer hood
The hood Makita makes for their 2012NB planer sucks so i made my own and I made it to accept 4" hose. Supports needed for the hood but not the flange. I designed a flange on the end to give it ample contact area for base adhesion. I made a 4" flanged connector for my shop with a sweep to it. You can design whatever works for your set-up.
You will have to cut the metal cover and attach it to the hood. You'll have to dril a couple holes for that. I used a couple low head semi tubular rivets but some low truss head screws will work. Apply a small bead of caulking between the two. You'll also have to drill the two holes for the screws that hold it to the planer; for me it was easier to do that instead of incorporating them in the stl design. If anyone has any questions just message me and I'll post some pics of what I have. Should be self explanatory.