This impeller is less agressive and does 0.75 rotations over the 45mm lenght and is for the small jet unit that featured on my youtube channel Daniel Kuizinas . Print this upside down with a brim i got away without support material but it is pushing the limits! I think it should be printed at 100% infill if it is going to be working hard , it has a recess suitable for a m8 nut which is 13mm across the flats then room for another nut behind to lock it you will need to use another nut in front unless using a spacer tube. The outside will need to be sanded to to fit tightly in the flow corrector as shown in the video