I wanted a prettier orifice reducer for my EEW Nano electric spinning wheel, so I put the design from my spiral spindle onto the disk. It goes nicely with my Celtic knot bobbins.
Prints flat, no supports needed. You will need to o-rings called for in Maurice's design description or you can reuse the ones on your OEM orifice reducer that came with your Nano.
The author remixed this model.