Leica Rangefinder Polarized Filter Holder

This is a polarized filter holder I designed and printed for my Leica M6 and M9 rangefinder cameras. It holds a 77MM polarized filter and fits on the end of my 50mm f/2 Summicron lens. Filter thread diameter: 77mm, Lens diameter end: 47mm. Clearances permits pressure fits of filter and on lens and can be removed easily so no screws, clamping, or other scratch inducing mechanisms are necessary! I've please a slot on the outside of the flange so that the filter effect can be seen while twisting th