3/16" ID tube to 40mm blower fan adapter
thingiverse
**Experimental** This is a very air-flow constrictive adapter, so use with caution. 336mm^2 to 3.02mm^2 reduction, so you can expect quite a bit of back pressure. Useful if you want to have a tusk-style printing part fan with a 40mm standard blower fan. **UPDATE:** Tested, and it doesn't work as I may have hoped. This type of blower fan has pretty much no resistance to back pressure, and as a result, displaces minimal air in the intended direction. This may work if the fan housing is modified for proportional air resistance, but otherwise, this is a job for a positive displacement pump.
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