Just saw this on thingiverse. I want to do a iris soooooo bad. Can’t wait for my GF.
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cool design. Wish they showed a pic of it closed as well 
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When the outer ring, in this case, is turned counter-clockwise, the little arms push the petals, they all slide down in unison until the hole is closed 
To reveal the clock again, one would slide that outer ring clockwise. This is like the iris box, essentially. Very cool
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