The Z-axis motor mount of MK4 is not compatible with just changing the rod diameter to 8mm, as the width of the rod axis is different from MK3. Therefore, I have remixed the MK3 mount to resemble MK4. You can use the X-axis parts and the Z-axis top without any modifications. By replacing this parts, you can expect an improvement in rigidity.
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The author remixed this model.
remixed the appearance in the style of a Prusa MK4.