Prusa i3MK3S yrodholder for standard M3 Nut
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Prusa i3MK3S+ y-rod-holder for standard M3 Nut

This is the Prusa i3MK3S yrodholder which I modified a tiny bit to make it work with standard M3 nuts ...

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Prusa i3MK3S+ y-rod-holder for standard M3 Nut alternatives