The numbers on the wheels represent the air gap in hundredths of a mm, so 25 = 0.25mm
Use the included 3MF, because I painted the seams to keep them away from the gaps to be tested.
I created the model in SolidWorks and exported at 2 degree tessellation angle, so the model should be very smooth.
Please let me know if you have any feedback, and I'll try to update the model as needed.
The author marked this model as their own original creation.