Better than any 3D printed prop i tested.
Then I’m afraid you haven’t tested decent printed props or there is an issue with printing.
I tried a few but had no success, usually cavitations and very low efficiency. With the stock prop i was able to get to 35kph and had a max efficiency of 45Wh at lower speed.
I would definitely love to try a few more. So if you can point me to a few good ones to test out, that would be great.