Pangu i3 z end stop holder
thingiverse
This will hold your z end stop firmly in place. I designed this after getting fed up of the included holder occasionally slipping down the z rail. It attaches to the printer with the existing screw and bolts, so no extra hardware required. If I were to print this again, I would make it 1cm shorter, as the z axis carriage (that holds the x axis motor) comes within about 1mm of the top.
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