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I posted a picture Instructable of this, and someone wanted me to make an instructable.
This mechanical iris has 6 segments, I plan to add more, it is "upgradable", as for that I can add more segments and fix broken ones. It can open and close smoothly, and it had a detachable strap to make it a monicle but I broke it a while ago
New thing: the first 2 people who make this will get a patch!
Edit: Win Guy already made one! look at the top comment and you will see it. There is only 1 patch left!
Step 1: Supplies
-Printout, image below
-scissors and hobby knife(Xacto Knife)
-snippers or plyers
-foam core, I used 1/4 in
-credit cards or gift cards with no protruding objects( I don't know now many I used, but I guess i used 3-4)