Prints in two sections which bolt together with 20mm M3 screws and M3 nuts. This lets you attach it without dismounting the motor.
The washer is meant to be glued to the bottom, see photo.
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snowblower-fan.jpg 2019-02-01 13:25 57K Fan for Noma Turbothrower 1500
snowblower.scad 2018-11-30 16:54 2.3K Fan for Noma Turbothrower 1500
impeller-full.stl 2018-11-30 16:45 278K
washer.stl 2018-11-30 16:38 20K
impeller-half.stl 2018-11-30 16:37 154K