0.4mm nozzle, 0.2mm layer
I used 100% infill to give it some mass so it spins nicely.
I also used concentric infill in the hope that might make it a little more uniform.
I had a thin gap on one ring, but i filled it in with a 3d pen and sanded it back; you cant even see it now.
The 5mm bore may need to be carefully drilled out so it fits nicely on your stepper motor shaft.
All credit goes to https://www.thingiverse.com/atartanian for creating the scad code here https://www.thingiverse.com/thing:802145 to generate this gyro.
I made it 40mm dia, 4 rings (the centre one is solid) and 8mm thick. Using the code you can re-do any size you want.
From there I imported it into tinkercad, and added a shaft with 5mm bore so it press fits onto my stepper motor (I have one on my bowden extruder motor and another on the x axis motor).
I rotated the gyro 30 degrees before 'joining' the shaft; this make sure it spins pretty wildly.
The rings of the gyro will be tight to begin with so, one at a time, rotate the rings while squeezing where they swivel until they spin freely.
My x axis spinner got very loose and started making some annoying vibration noise, but a few well placed drops of oil and its been quiet for weeks.