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Updated by Chas Murillo 8 months ago
# [**Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade 1.01**](https://help.prusa3d.com/category/original-prusa-i3-mk3-mk3s-mk3s-to-mk4s-mk3-9s-upgrade_2176)
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