[bojan]

I think I will try to print this for my C11 on first occasion..

The original idea was to print 4 segments, but then I realized 3 or even only 2 will be enough to produce usable diffraction pattern.
The flip segments will be fixed on the steel rope ø1 mm (purple), which will act as a flexible shaft, moved by DC motor.
It is a pity MyFocuserPro currently does not support mask.. Maybe one day it will :-)

EDIT:
It just occurred to me the steel rope could be used as a heater..