Very cool design and worked great. I may try to print a scaled down version to make a mini fountain or faucet attachment. It could also be scaled up a lot to make a larger vortex; I was able to achieve the desired effect at normal size with only about 1/3rd water pressure. I did not place any magnets in mine because I only wanted the effect of the vortex.
Prusa i3 MK2 with 0.4mm nozzle
0.20mm res / Print Time: ~6 hours for funnel / ~5 hours for top
No Supports (Next time I print I will use supports for the funnel piece because there is a near-90 degree overhang that comes out very rough without supports. The top swirl piece prints perfectly without supports).