So I've designed a O Gauge Lego axle to be imported to Studio to help design O gauge Lego trains. I'm going to experiment tomorrow how 3D printing the wheels goes, it might be a viable method to make suitable wheels.
Here's the axle I designed:
Studio renders it a bit weird, but no big deal.
I've attached the file for the model of the wheelset, you need to import it to Part Designer and then export it to Studio.