MK3S+ and MK3S+ MMU2S extruders are very similar, just a few parts will be changed. The most important is, we need to release the cable bundle.
⬢Using an Allen key release the M3x40 screw and open the door.
⬢Release two M3x10 screws and remove the extruder-cable-clip. On older printers cut the zip tie.
⬢In case there are zip ties inside the Einsy-case, carefully remove them.
⬢Remove the zip ties on the cable holder.
⬢Keep the textile sleeve on the cables, but make sure the cable can slip inside. It might be twisted around other cables, in such case, you have to remove the sleeve.
⬢Carefully unplug the IR filament sensor cable and make sure it is free inside the electronics box.
We need to gently pull the IR filament sensor cable slightly towards the extruder as the sensor will be in a different position. Make sure the entire path of the cable is free. However there is no need for a complete disassembly.
⬢Release all four M3x10 screws on the X-carriage-back. You can keep them in the printed part.
⬢Move the X-carriage-back back about 10 mm (0.4 inch) to ensure the cables can move back and forth.
While releasing other screws in the next steps, make sure to check each screw is still holding all the parts. If you release the screws above certain level, the entire body will fall apart.
⬢Grab the wires of the IR filament sensor cable and gently pull up, the cable should slide without significant resistance.
⬢Does it move? Great the test is over for now ;)
Don't pull hard! Ensure first that all screws are released properly.
⬢Great! We are done here, let's move to the assembly chapter.
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