I’ve mentioned before that I don’t want to put a clown shoe suck device on my S03 and I stumbled across a creature called a “Bitfan” at another machine’s website (this was after someone on this forum brought one to my attention). The other machine company provided a downloadable stl file for 3D printing so that’s where I started. In the pix below, you can see some history.
The lower two fans without the outside cylinder in the lower left were printed on my university’s 3D printer. For some reason, it only printed the blades. When I pointed that out, they downloaded the stl themselves and printed the two versions in the upper left. Both of those would really need to be cut down. So I imported the stl into fusion 360 and cut my own after enlarging it from 1 inch to two inches. That’s the black one in the top center. I chose HDMW plastic. It did not do well on the S03…it was all fuzz when finished. I should have taken a photo of it because you wouldn’t have known what it was. Anyway, I took one of the 3D printed fan blades and made a silicone mold (upper right) and cast the one in the lower right. It’s actually very acceptable. Then I bought a plastic cutting board and recut the fan in plastic, lower center,
So this just slips on over the bit and blows at the speed of the router or spindle. Do I have to worry about it falling off the bit? Not really because it’s pushing air down and the opposite force to that is to push the fan up against the chuck. It does a reasonably good job of keeping the chips and sawdust off the work and depositing them all over the shop. I’m not sure that I notice any difference between just the blades and the blades and cylinder. They’re not the best pieces of CNC work you’ll see, I’ll admit. I’m sure that someone with even a little skill could make it a lot cleaner.