smooth spinner openscad

My openscad model for spinner.
Changing variable
o = 0.4; // mm
you can tune bearing hole for you printer to exact sizing.
in stl +0.4mm

I am using cura and tevo black widow
and hole for bearing get exactly 22.0mm

changing variable
n = 4;
you can change quantity of bearing.

dB and hB - diameter and height of bearing.
22x7 fot 608 for default.