End Stop
thingiverse
Fixed on the 8 cm optical axis. Use a 2mm self-tapping screw. Dimension drawing of limit switch available at https://www.google.com/search?q=omron+endstop&espv=2&biw=1234&bih=615&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiJ3rPd9K_RAhVH2xQKHfOuDg8Q_AUIEigB.
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