this is an opening tool for the filter cap for the NanoHack (thing:4231069) type mask filter cover. I suggest to lightly apply some lubricant like techical vaseline or even some sunflowe oil on the thread of the cap but anyway this tool helps a lot some time.
Here is a youtube video of the previous version (the neck of the handle was too narrow and infill was too weak so I had to make this version) https://youtu.be/8ZnYjqaa_GQ
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