Flexible Filter Lens Caps
thingiverse
If you shoot a lot of video and use ND filters you know it's a pain to find a lens cap that will fit the filter (which slim filters being the worst) instead of constantly removing it. it's similar to what Polar Pro packages their Peter MacKinnon VND filters with but good luck trying to find something aftermarket. Using this, you will not have to touch the the filter at all. The whole thing consists of 2 parts, the lens cap made out of flexible material (I used TPE) and a lid which I made out of PLA but I think PETG will be better long term.
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