CNC Collet Nut Fan (ER20-M type nut)
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Wanted to get a little a extra dust collection / expulsion for my CNC. Worked great. Red printed fan is 16mm fin length.
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- Creative Commons — Attribution — Noncommercial
I've seen these types of fans a bunch but none of them were the right size for my collet nut (ER20-M), so I decided to make my own.
These are filleted and chamfered in all the right places. Tested the 9mm, 12mm, and 16mm to 24K RPM for 30 minutes (in PLA, PETG, and ASA), and I've used the 9mm version for hours of cutting in PLA and ASA. I found the 9mm seemed to work the best for me, plus it was the only one that fit in my tool magazine.
Make sure to print with 4 walls so there is no infill, as that could cause disbalance at higher RPM's.
These are made for suction, but a simple mirror will turn these into blowers for use in metal processing or without a dust collection mechanism.
PS: seems I deleted the 16mm file, let me know if you need it and I can generate, but it was a little too much at 24K RPM.