M5 Festo fittings ?

[bryn51]

Is it possible to have a version of 5 x PTFE tubing holder that takes M5 threaded brass inserts (for Festo QSM-M5-4 Pneumatic). These I already have, whereas I would have to order in the M6 or M10 sized fittings. For the collet style, I'm looking at the E3D style "Embedded Bowden Collet for Metal (1.75mm)" - is that the right one ? Also has a clip "Collet Clips (Pack of 2) - 1.75mm × 4" seems useful for locking the collet in place.

Really, a proper BOM would be handy, giving official part numbers that can be searched for, ensuring money isn't wasted on buying the wrong things.

[davidkerny]

Hi! Unfortunately, the M5 fittings are not the bore type - so that the PTFE tube could go through. M5 fitting solution wouldn't be as convenient as the other suggested options. The PTFE tube shape just behind the pulleys is crucial in order for the filaments to load and unload properly.

Yes, the E3D collets are the ones used on the original MMU3. The collet clips can be helpful, but are not necessary. Those can also be printed easily. M6 or M10 fittings are alternatives to the collets.

As this is an upgrade to the Original Prusa MMU3, all parts required should be obtained from the Prusa MMU3 Kit. In case you are upgrading from MMU2S, the extra hardware required can be obtained by getting the MMU3 Upgrade - or by getting the components listed in the description. As Prusa does not use part numbers publicly - and the separate components of the MMU3 Kit are not available on the eshop yet, it is hard to provide the links to them.

[bryn51]

Thanks David for your reply.

I’m currently printing your parts-set for upgrade if an MMU2S connected to a Mk3S+ printer. to gain advantage of the many improvements. With a mind to a full upgrade when Prusa release the MMU2>mmu3 upgrade kit. But that will not be until late August.

I’m particularly interested in your specific upgrade of the idler cover because this is something I recommended to prusa in September of 2022, in report I wrote and shared with them.

The means of securing the feed-in filaments is also of interest to me because of the many times I’ve had to clear those darned tubes and had to pull apart the mmu2 to do so.

In regards your project, from my perspective it would be much easier to build if there was a BOM listing specific products and sources like those collets or 6/10 mm festo fittings with mating bushings, since I do not actually have prusa’s kit, and cannot currently order it.

Many thanks Bryn Parrott

On Mon, 7 Aug 2023 at 21:24, davidkerny @.***> wrote:

Hi! Unfortunately, the M5 fittings are not the bore type - so that the PTFE tube cannot go through. The PTFE tube shape in the back is crucial for the filaments to load and unload properly.

Yes, the E3D collets are the ones used on the original MMU3. The collet clips can be helpful, but are not necessary. Those can also be printed easily. M6 or M10 fittings are alternatives to the collets.

As this is an upgrade to the Original Prusa MMU3, all parts required should be obtained from the Prusa MMU3 Kit. In case you are upgrading from MMU2S, the extra hardware required can be obtained by getting the MMU3 Upgrade - or by getting the components listed in the description. As Prusa does not use part numbers publicly - and the separate components of the MMU3 Kit are not available on the eshop yet, it is hard to provide the links to them.

— Reply to this email directly, view it on GitHub https://github.com/davidkerny/BUZA-ULTIMULTI/issues/1#issuecomment-1667509604, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAZV5KJDANOQDMBCSX5NGKTXUCX5TANCNFSM6AAAAAA3GFKGHM . You are receiving this because you authored the thread.Message ID: @.***>

-- Bryn Parrott Taichung, Taiwan Ph +886 912448228

[davidkerny]

Hi!

I've seen you mentioning your 2022 report before - but wasn't able to find any specific information about that. Sounds interesting though. Can you maybe share the exact report you sent to Prusa back then? What channel you used to contact Prusa?

I will try to make an assembly video / guide and BOM once I find some time to do it ;)

D.

[bryn51]

Hi David,

Its an awkward thing. I told them at the time it was confidential to them as the only recipient.

You have to promise to share it with anyone, nor give reference to it.

Its not a secret report, but I wanted not to embarrass the company by doing what everyone else was doing, and vilifying them. The language in the report is neutral, not emotive throughout.

I like to think that it was listened to, as evidence indicates not soon after that, they started work on the MMU3. And implements most of the recommendations in the report, plus a few of their own.

Can you make an undertaking not to share it ?

Thanks, Bryn Parrott

From: davidkerny @.> Date: Saturday, August 12, 2023 at 02:55 To: davidkerny/BUZA-ULTIMULTI @.> Cc: Bryn Parrott @.>, Author @.> Subject: Re: [davidkerny/BUZA-ULTIMULTI] M5 Festo fittings ? (Issue #1)

Hi!

I've seen you mentioning your 2022 report before - but wasn't able to find any specific information about that. Sounds interesting though. Can you maybe share the exact report you sent to Prusa back then? What channel you used to contact Prusa?

I will try to make an assembly video / guide and BOM once I find some time to do it ;)

D.

— Reply to this email directly, view it on GitHubhttps://github.com/davidkerny/BUZA-ULTIMULTI/issues/1#issuecomment-1674923504, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AAZV5KPF5EC7H2SJPF65GTDXUZBWJANCNFSM6AAAAAA3GFKGHM. You are receiving this because you authored the thread.Message ID: @.***>

[bryn51]

Hi David,

As mentioned, I have printed out your kit of parts to build the UltiMulti version of MMU3.

And its basically done, waiting on delivery of various parts over the next 6 weeks from different parts of the world.

However now that’s done, I also printed the buffer unit with revised design by Prusa.

And then tried to fit it into my Prusa Original Enclosure, discovered it does not actually fit as designed by them.

There are various things wrong, but the lain thing is that the part that secures the buffer to the printer frame is wrong size, and also the buffer will not fit alongside the right of the printer, there isn’t enough space alongside the right of the Frame Z axis. Clearly Prusa forgot that some people might actually have the Enclosure and want to use it with a printer having the MMU3 fitted.

So it occurred to me that this is something you might want to tackle. It requires only a couple of parts to be designed. One is the mount. The other is a small part to feed the tubing from outside the enclosure in toward the buffer. There are 3 possible holes in the enclosure that might suit people in different situations. One on top of the lid in the middle, another in the central back of the enclosure lid, and a third on the right corner (vertical) of the rear window of the enclosure. (thay are all different shapes. But whats needed is a plastic part having 5 x 4mm holes to accept the tubing and hold it secure.

So, for your consideration.

Cheers, Bryn Parrott