This showerhead makes a good use of bad or rejected nozzles.

Creality

Ender 3 Pro

No

Yes

Don't use infill.

It seems to be better to use a huge number for wall count, like 400. Don't repeat my mistakes and set 105-110% flow, otherwise, you'll get leaking from between layers.
It also may be a good idea to have ~240C temperature for better layer adhesion. I printed it with a 0.6 mm nozzle. Probably, higher is better, but who knows if the threads will be fine with a bigger nozzle.