https://learn.adafruit.com/supernova-poi?view=all#
https://github.com/adafruit/Kinetic_POV
inner PC tube 16.21mm OD 12.88 ID – cut to 157mm long – cut notch in side for wires to exit
outer PC tube 25.9mm OD 22mm ID cut to 28cm – end with cap should be cut straight – holes for end cap drilled after fully assembled