This is an air-exhaust deflector for the Makita RT0700c trim router. This trim router is a popular spindle for Kit and DIY CNC machines. One problem with the router is that cooling air is exhausted out of the bottom of the router blowing cutting dust every where. The exhaust also defeats the dust collection shoe-boot that I have...blowing dust out of the bottom of the shoe.
I printed this deflector in two parts and glued together. You may be able to figure out how to combine the parts and print as one piece. The ring that clamps onto the router is only 6mm wide. That's all the room I had between the bottom of the spindle holder and the bottom of the router. But it seems to hold well. If you need, just extend the top and re-position the holes.
Router measurements came from a CAD model of the RT0700 found on GrabCAD...https://grabcad.com/library/makita-rt0700-1
The deflector was printed in PLA on a Tronxy P802E.