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Nicognac
(@nicognac)
Active Member
MMU3 Buffer Hardware

Hi! I’m looking to upgrade my buffer after purchasing a used MMU3 (it came with the MMU2S buffer) but I can’t two components: 

1) the bearings for the wheels in the cassettes (no size is listed)

2) the pins for the bearings in the cassettes.

Is there a hardware kit I can purchase somewhere?

Posted : 19/05/2024 4:04 pm
Nicognac
(@nicognac)
Active Member
Topic starter answered:
RE: MMU3 Buffer Hardware

Also the Collets! Where can I find the colletes!

Posted : 19/05/2024 4:26 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: MMU3 Buffer Hardware

Embedded Bowden Coupling for Metal

https://e3d-online.com/collections/all-spares

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 : 20/05/2024 9:31 am
Nicognac
(@nicognac)
Active Member
Topic starter answered:
RE: MMU3 Buffer Hardware

Awesome thanks! What about the bearings and pins. Any ideas?

Posted : 21/05/2024 7:34 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: MMU3 Buffer Hardware

Dare I say RTFM...   Lol 
https://help.prusa3d.com/guide/7-cassette-buffer-assembly_381796

Bearings type 693 - 2RS
Pins 2.9x8.5mm  (you can probably print these)

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 : 21/05/2024 8:11 pm
Nicognac
(@nicognac)
Active Member
Topic starter answered:
RE: MMU3 Buffer Hardware

Thanks for the reply! I saw the manual but I thought that 693 - 2RS bearings come in multiple sizes! Are these the 3x8x4mm ones? Thanks for sharing the pin file!

Posted : 22/05/2024 8:06 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: MMU3 Buffer Hardware

to be honest I have not looked at the dimensions of the bearings themselves.  3X8X4mm sounds reasonable
693 is the bearing descriptor, 

2RS means 2 rubber seals (you can get open ball bearings, rubber sealed bearings and metal shielded bearings)  Prusa chose rubber seals in this case. 

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 : 22/05/2024 8:11 pm
Saphir
(@saphir)
Active Member
RE:

I opened mine for you and measured them. Yes, the bearings are 3x8x4.

This post was modified 3 weeks ago by Saphir

Printing PLA and PETG at the same time? See the Guide for MultiMaterialSupports ----- Ejecting Buffer cassettes is not satisfying? May the Fork be with you!

Posted : 23/05/2024 6:51 am
Nicognac
(@nicognac)
Active Member
Topic starter answered:
RE: MMU3 Buffer Hardware

That was extremely kind of you to do. I just ordered some on eBay. Thank you!

Posted : 23/05/2024 11:59 am
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