Attach it just by the top hooks.
Please be aware that the MMU3 on MK4 IS NOT COMPATIBLE with older PrusaSlicer profiles or G-codes for MMU2, MMU2S, or even MMU3 + MK3S+ or MK3.5.
Using an incompatible G-code file on the MMU3 + MK4 could lead to a failed print or potentially damage the printer!
Update the printer’s firmware. First, transfer the firmware file onto a USB drive.
During the filament sensor calibration, you will need to use a short piece of filament. Prepare a filament and select Continue.
Older type of these fittings has a blue collet.
Various versions of the blue fittings were included with Prusa products shipped before April 2024.
The PTFE tube bundled with the MMU3 for MK4 has an internal diameter of 2.5mm. In case you are upgrading from the 2mm ID MMU2S tube, and you have trouble distinguishing between the old and the new one, try comparing the internal diameter of the two. See the second picture. The tube on the left is the new one.
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And if that doesn't do the trick, you can send an inquiry to [email protected] or through the button below.