Optical shutter / beam block for Thorlabs-style cage mounting

thingiverse

Inspired by Tjsangster's peep hole cover, I created a 30 mm cage mounting that lets me use it in an optics lab easily. This project took just 30 minutes to complete :). Be cautious not to block laser beams with this design without first testing it thoroughly - ideally with a substantial safety margin! It can absorb light and get warm, even melting, so don't take any chances. Instead, consider using it to protect sensitive spectrometers and detectors or creating a simple slit for a microscope lamp.