IR-blocking filter holder for green laser
thingiverse
You can't just rely on any old laser pointer, because those cheap green ones don't have an infrared filter, which means they blast out a ton of extra light in the infrared range and increase the risk of serious damage to your eyesight big time. A simple IR-cut filter is all you need, and you can snag one for pennies on ebay or aliexpress - just slip it onto the end of your pointer using this handy holder. To make sure it's secure, a few drops of superglue should do the trick.
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