Summary
NOT FOR 3D PRINTING.
Machining is probably best for this.
Measurements taken from the adaptor that comes with Shutter Precision/Exposure QR15 dynamo hubs.
It’s a bit of a loose fit to the nominal 15 mm ID on the hub. You can certainly make it to better tolerances. I just copied what I measured.
15 mm thru-axle to 9 mm QR front adaptor 3D Print Model
