![Úvod](https://cdn.help.prusa3d.com/wp-content/uploads/2024/04/34a2d6c7ffe30255809a0bd0c1fcbc53_painted.jpeg)
⬢V tomto návodu budeme upgradovat tiskárnu MK3S+ MMU3 na MK3.9/ MK4 MMU3.
⬢Make sure your MK3.9 / MK4 printer is fully assembled and tested.
⬢MMU3 installation requires extruder modifications. However, we need to make a few other adjustments before proceeding with that.
⬢Pojďme si v rychlosti zopakovat klíčové body, kterými se budeme v tomto návodu zabývat: