Linear Polarizing Film Holder
thingiverse
A linear polarizing film holder, to make it easy to see and change the polarization of light. The film is held between the outer square and the small inner frame, and the big triangle on the outer square acts as a pointer in the direction of polarization, and a handle to move the filter. Fits approx 80mm x 80mm flat square polarizer films like these: https://www.amazon.com/gp/product/B004X3XFHU/ (If yours don't fit, you can either adjust the CAD or carefully trim the filters with a sharp pair of scissors.) I have a short video showing these frames in action to demonstrate the three-filter effect: https://youtu.be/5SIxEiL8ujA
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