*Only for people with printing accuracy problems: Check out Version 2 with adjusted, wider tolerances for easier printing here:
https://www.printables.com/model/1061874-mechanical-iris-v2-wider-tolerances-print-in-place
very smooth action! (improved 16.10.2024)
print time: ~1h
outer diameter: 8cm
supports: none
tolerances: 0.1-0.2mm
fidget experience:

use of helical gears:
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well calibrated 3d printer required! (works as a tolerance test)
functions perfectly as a fidget toy
Have fun!
The author marked this model as their own original creation.