It's bad enough we're having to use this button... might as well save ourselves the effort of finding that hex key yet again to sneak into the hole to press it.

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This is just a quick remix of KmanSweden's MMU2 reset button… but I made it slightly longer and thicker, to get rid of some of the wiggle. The result is a tighter fit, and a more satisfying “click” to the button.

I found that the little taper at the end makes the contact area with the button smaller, making the click a little snappier, with more of a rebound.

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I printed this in Prusament PETG, with 0.15mm layer height. It should be snug enough not to rattle around, but loose enough to be easy to push (and bounce back).