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Volker
(@volker)
Trusted Member
Cable MMU3 to MK4

My MMU3 on the MK3 is running. The only difference (beside Firmware) to the MK4 version is the cable to the xbuddy board.

Any idea how the pin assignment should be? There is a pin assignment of the xbuddy board available.
Zubehör-Anschlüsse (MK4) | Prusa Knowledge Base (prusa3d.com)

But I'm wondering how to wire it correctly 

Posted : 23/12/2023 8:48 pm
fernandotg81
(@fernandotg81)
Eminent Member
RE: Cable MMU3 to MK4

The MMU3 is not yet available for the MK4

Posted by: @volker

My MMU3 on the MK3 is running. The only difference (beside Firmware) to the MK4 version is the cable to the xbuddy board.

Any idea how the pin assignment should be? There is a pin assignment of the xbuddy board available.
Zubehör-Anschlüsse (MK4) | Prusa Knowledge Base (prusa3d.com)

But I'm wondering how to wire it correctly 

 

Posted : 24/12/2023 6:47 am
Volker
(@volker)
Trusted Member
Topic starter answered:
RE: Cable MMU3 to MK4

I know. But the only difference will be the cable and probably some changes on the nextruder. If I have the cabel I could make some tests to see how far I can go.

Posted : 24/12/2023 8:35 am
fernandotg81
(@fernandotg81)
Eminent Member
RE: Cable MMU3 to MK4

I want to think that if it were as you indicate, MMU3 would already be available for MK4.

Posted : 24/12/2023 11:12 am
Volker
(@volker)
Trusted Member
Topic starter answered:
RE: Cable MMU3 to MK4

Actually the MMU3 for the MK4 is running and was presented lately on a printer show. According to Prusa it is not reliable enough to sell it. That's the point: I want a bit experience and see how good it already is.

Posted : 24/12/2023 12:41 pm
graemesmith1960
(@graemesmith1960)
Active Member
RE: Cable MMU3 to MK4

I only use the MMU for ease of loading different materials.  I rarely print in more than one colour so I don't really care how good the filament changes are I just want a basic MMU working.

I've had a very quick look at the pinouts for the xBuddy Board compared to the Einsy-Rambo Board.  Not as straightforward as I'd hoped.  The Einsy-Rambo MMU header has 5 pins but the xBuddy header has 12 which means that it will need more than a new plug.  I suspect that the required cable will connect differently at the MMU end as well.  Plenty of variations possible with the new MMU3 control board.

Posted : 24/12/2023 4:55 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE:

The MMU3 uses a Standard MMU2 controller board, plus a small daughter board. which I believe contains a Buck Regulator, and  connects to the data and power connectors on the mmu controller.

the Mk4 to MMU3 cable handles both power and data I don't know why it requires 12 wires, where as the mk3/mmu2 had two cables 4 wire data and 4 power wires. the MMU3 daughter board uses the new style  of connectors

the enclosed snip was from the Sanjay Mortimer Rep Rap Festival, in Oxford
https://storage.googleapis.com/prusa3d-content-prod-14e8-wordpress-forum-prod/2023/12/a8419113-compressed-mmu3.mp4

 

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 24/12/2023 9:46 pm
ssmith and K7ZPJ liked
Tim
 Tim
(@tim-10)
Eminent Member
RE: Cable MMU3 to MK4

Do you know of a source for the cable?

Posted : 13/01/2024 7:09 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Cable MMU3 to MK4

I expect Prusa will make the cable available when they release the MMU3 kit for the Mk4 Printers. 
regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 13/01/2024 7:51 pm
Tim liked
Tim
 Tim
(@tim-10)
Eminent Member
RE: Cable MMU3 to MK4

I saw the video you posted of the MMU3 and MK4 in action. I wonder where the owner got his cable?

Posted : 15/01/2024 8:01 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Cable MMU3 to MK4

The Printer I saw, was owned by Prusa. and it was on their stand at the show, so I suspect the cable bundle came from their secret stockpile in Prague...   

Miklas, and Shane, were both on the stand, chatting with Users. 

there were other prusa Reps. on the stand, but I didn't recognise their names. 

 

Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 15/01/2024 10:54 pm
Mykal451
(@mykal451)
Eminent Member
RE: Cable MMU3 to MK4

I made a cable for MMU 3 (PD Board) to MK4 Controller back in August (2023), at that time the MK4 firmware would error saying "MMU Firmware Update Needed", it said the MMU firmware was incompatible with the MK4 firmware (I'm still not aware of any MK4 specific firmware for the MMU3).

Easiest way to make the cable is to buy the prewired double ended 2x6 connector cable assembly, and a separate 1x8 pin connector for the PD-Board. Just remove the wires from one of the 2x6 connectors and slide them into the 1x8. No crimping, no questionable connections, etc. 

Be aware that Slicer 2.7.1 does not allow you to configure an MK4 with the MMU3, no multi-color slicing yet, so this is all just an exercise in futility.

I'll double check this again tomorrow, and update my post, but very sure with latest MK4 firmware the MMU3 is recognized, and I could load each filament with the printer  menu / controller.

Will post my cable pin outs tomorrow, have an early AM meeting, already up too late !!

-mp

 

Posted : 16/01/2024 5:19 am
Tim liked
Tim
 Tim
(@tim-10)
Eminent Member
RE: Cable MMU3 to MK4

Thank you very much.

Posted : 16/01/2024 6:07 am
Tom De Winter
(@tom-de-winter)
Trusted Member
RE: Cable MMU3 to MK4

 

Posted by: @volker. According to Prusa it is not reliable enough to sell it. That's the point: I want a bit experience and see how good it already is.

No, it’s reliable enough to sell it. Just not reliable enough to deliver it.

Posted : 16/01/2024 2:45 pm
Mykal451
(@mykal451)
Eminent Member
RE:

 

Posted by: @mykal451

I made a cable for MMU 3 (PD Board) to MK4 Controller back in August (2023), at that time the MK4 firmware would error saying "MMU Firmware Update Needed", it said the MMU firmware was incompatible with the MK4 firmware (I'm still not aware of any MK4 specific firmware for the MMU3).

Easiest way to make the cable is to buy the prewired double ended 2x6 connector cable assembly, and a separate 1x8 pin connector for the PD-Board. Just remove the wires from one of the 2x6 connectors and slide them into the 1x8. No crimping, no questionable connections, etc. 

Be aware that Slicer 2.7.1 does not allow you to configure an MK4 with the MMU3, no multi-color slicing yet, so this is all just an exercise in futility.

I'll double check this again tomorrow, and update my post, but very sure with latest MK4 firmware the MMU3 is recognized, and I could load each filament with the printer  menu / controller.

Will post my cable pin outs tomorrow, have an early AM meeting, already up too late !!

-mp

 

Update . . . I'm running MK4 firmware v5.1.2 & MMU3 firmware v3.0.1. Once you enable MMU in "settings" the printer does recognize the MMU3. I can load filament using the MK4 menu / controller. I'm able to load filaments to the MMU tubes 1-5 and to the Extruder. Haven't tested anything beyond this, be careful and watch your printer like a hawk if you go down this path.

OK, so here's my wiring diagram MK4 to PD-Board on MMU3. HUGE DISCLAIMER !! . . . do this at your own risk, I take no responsibility if you fry your xBUDDY board or MMU PD-Board !! If you have no clue what your doing, please exercise patience and wait for the official releases from Prusa.

I also wonder if Prusa's official cable will use dedicated +24V & GND wires to the PSU, similar to MK3 wiring.

Correction: I bought a couple prewired Molex 8-wire cables with two 1x8 connectors (molex 5025780800), then used a 2x6 connector (molex 5031491200), unclipped the necessary wires, moved them to proper locations on the 2x6 to make my cable

Curious to see if someone takes this forward to the next step . . . print something multicolored on an MK4 !!

Enjoy -mp

This post was modified 1 month ago by Mykal451
Posted : 16/01/2024 4:59 pm
skoro liked
Tim
 Tim
(@tim-10)
Eminent Member
RE: Cable MMU3 to MK4

Not knowing what I was doing never stopped me before (it's been rather expensive, however).  I'll give it a try.

Thanks

Posted : 16/01/2024 5:18 pm
Volker
(@volker)
Trusted Member
Topic starter answered:
RE: Cable MMU3 to MK4

That's very interessting and valuable information! I think I will go into this direction. I'll keep you updated (will take some weeks)

Posted : 16/01/2024 5:30 pm
Mykal451
(@mykal451)
Eminent Member
RE: Cable MMU3 to MK4

IMPORTANT: Use this updated wiring diagram, although my connector image is oriented correctly I had the pin numbering opposite. There is a super tiny triangle, so hard to see, on the connector to denote pin 1.

Correct drawing is named: MK4 to MMU3_corrected 1x8 pin numbering 01-16-24.png

Posted by: @mykal451

 

Posted by: @mykal451

I made a cable for MMU 3 (PD Board) to MK4 Controller back in August (2023), at that time the MK4 firmware would error saying "MMU Firmware Update Needed", it said the MMU firmware was incompatible with the MK4 firmware (I'm still not aware of any MK4 specific firmware for the MMU3).

Easiest way to make the cable is to buy the prewired double ended 2x6 connector cable assembly, and a separate 1x8 pin connector for the PD-Board. Just remove the wires from one of the 2x6 connectors and slide them into the 1x8. No crimping, no questionable connections, etc. 

Be aware that Slicer 2.7.1 does not allow you to configure an MK4 with the MMU3, no multi-color slicing yet, so this is all just an exercise in futility.

I'll double check this again tomorrow, and update my post, but very sure with latest MK4 firmware the MMU3 is recognized, and I could load each filament with the printer  menu / controller.

Will post my cable pin outs tomorrow, have an early AM meeting, already up too late !!

-mp

 

Update . . . I'm running MK4 firmware v5.1.2 & MMU3 firmware v3.0.1. Once you enable MMU in "settings" the printer does recognize the MMU3. I can load filament using the MK4 menu / controller. I'm able to load filaments to the MMU tubes 1-5 and to the Extruder. Haven't tested anything beyond this, be careful and watch your printer like a hawk if you go down this path.

OK, so here's my wiring diagram MK4 to PD-Board on MMU3. HUGE DISCLAIMER !! . . . do this at your own risk, I take no responsibility if you fry your xBUDDY board or MMU PD-Board !! If you have no clue what your doing, please exercise patience and wait for the official releases from Prusa.

I also wonder if Prusa's official cable will use dedicated +24V & GND wires to the PSU, similar to MK3 wiring.

Correction: I bought a couple prewired Molex 8-wire cables with two 1x8 connectors (molex 5025780800), then used a 2x6 connector (molex 5031491200), unclipped the necessary wires, moved them to proper locations on the 2x6 to make my cable

Curious to see if someone takes this forward to the next step . . . print something multicolored on an MK4 !!

Enjoy -mp

Posted : 16/01/2024 6:04 pm
Tim
 Tim
(@tim-10)
Eminent Member
RE: Cable MMU3 to MK4

Thanks.

Posted : 16/01/2024 6:55 pm
graemesmith1960
(@graemesmith1960)
Active Member
RE: Cable MMU3 to MK4

That's great thanks.  I'm quite happy to have a go and see what I can get the MMU to do.  I just use it for filament management and rarely print multi colour.

Posted : 17/01/2024 1:23 pm
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