Prusa i3 MK3 Clone xendmotor and xiendidler for brass nut
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Prusa i3 MK3 Clone x-end-motor and x-iend-idler for brass nut

The original MK3S uses POM nuts on the leadscrews This design works with the more common 22 mm brass nuts ...

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Prusa i3 MK3 Clone x-end-motor and x-iend-idler for brass nut alternatives