3. Buffer upgrade

Relevant for:

MMU3

Last updated 6 months ago

Difficulty

Easy

Steps

Available languages

Step 1 Buffer cartridge INFO

⬢In this chapter, we will check the MMU3 Buffer.

⬢There have been several versions of the buffer cartridgees available, which might look slightly different.

⬢The MMU3 for the MK4 printer necessitates the use of the most recent buffer cartridge design, Version B.

Version B has been included in MMU3 packages shipped after April 2024. If you have this version, skip this chapter.

The version B accommodates the slightly longer unload distance of the Nextruder. If you're adapting an older MMU3 unit to the MK4, it's necessary to reprint the plastic parts of the buffer cartridge to ensure proper compatibility.

⬢In case you have the version A of the buffer cartridges, proceed to the next step.

Step 2 Buffer preparation

⬢Remove all the PTFE tubes from the buffer segments.

Push the collet in and hold it. Push the PTFE tube in, then pull it out to remove it easily.

⬢Remove all the segments from the buffer.

We need to disassemble the buffer segments and reassemble them using the updated plastic parts.

Save all the hardware components as we will need to reuse them.

Step 3 Segment disassembly (part 1)

⬢Take first of the segments. Orient it so that the side with the three nuts is facing up. Remove the M3x6 bolt.

⬢Turn the segment around.

⬢Remove the remaining four M3x6 bolts.

Step 4 Segment disassembly (part 2)

⬢Remove both the collets from the buffer segment.

⬢Lift the top section of the buffer segment to take it apart.

⬢Remove the center shaft from the bearing.

Step 5 Segment disassembly (part 3)

⬢Remove the center wheel.

⬢Remove the three M3n nuts from the bottom part of the segment.

Pro tip: use a long M3 bolt partly screwed into the nut. Wiggle it slightly, while pulling the nut out.

Step 6 Buffer segment parts preparation

⬢For the following steps, please prepare:

⬢Buffer Segment (10x)

Make sure you are using the version B of the buffer segments.

⬢Replacing the segment wheels isn’t necessary. We suggest using the old ones with the bearings already in place.

Step 7 Continue to the Segment assembly

Now, you will be redirected into the Original Prusa MMU3 Assembly guide, containing the rest of the buffer cartridge assembly as well as the new spoolholders assembly, followed by rebuilding the extruder and calibrating the setup.

⬢

Continue to the Segment assembly in the MMU3 Assembly guide.

3. Buffer upgrade

3. Buffer upgrade

Step 1 Buffer cartridge INFO

Step 2 Buffer preparation

Step 3 Segment disassembly (part 1)

Step 4 Segment disassembly (part 2)

Step 5 Segment disassembly (part 3)

Step 6 Buffer segment parts preparation

Step 7 Continue to the Segment assembly

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