The new MMU2S "chimney" makes it a pain to remove the Festo fitting without a wrench handy. Presto, wrench.
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![MMU Festo Wrench [SCAD] 3D model preview](https://media.printables.com/media/prints/1625/images/10328_b6e5e992-d181-49b3-a248-a4b0f159bcb5/lol-mmuwrench_pic01.jpg)