Firmware 1.0.1 for the MMU2 unit  

Re: Firmware 1.0.1 for the MMU2 unit

How do we make posts with suggestions where they will get read? The shotgun approach doesn't help people maintaining the list and it doesn't help the users.

Hi Khalil,
I have the same idea regarding the filament sensor and I intend to discuss it with them on Monday 😉

I have posted that exact idea here, on GitHub, under both printer and mmu, and gotten no response. I was hoping to get into why it wasn't done (presumably the unreliable optical sensor) so options could be discussed (people use an interstitial ball bearing of software filtering, and I suggested averaging as well).

The user base is using the machines, they are having similar, repeatable experiences, and I see stuff like "the manual doesn't reflect reality" and we get the run around. I mentioned the manual's problem here, was sent to GIT, mentioned it on GIT, was sent to another part of GIT, mentioned it there, was told to comment on the instruction site directly. I did it there and was told to try github.

Many of your users are reasonable advanced folk (I've built robotics for NASA and I'm sure I'm about average for many of the people) - give them the tools to help fix the issues. Someone who writes 20 posts could also do testing.

I went from printing back to back and tuning my retractions to needing 6 or 7 resets and start-overs to get the first layer to come out without spurious filament changes and jams from firmware-unloading.

Re: Firmware 1.0.1 for the MMU2 unit

Regarding the jams, did you change the PTFE tube in the hotend for the new one? It has smaller diameter and helps shape the filament better, than the stock version.

I asked support if I could buy a longer piece of tube (in order to skip the transition for the smaller ~2 cm piece above the optical sensor), and they said no. This should be an option!

When pressed for the dimensions, I was told the orange PTFE is 4mm OD, 2mm ID, making it larger than (for instance) Capricorn tubing and many others.

I was told NOT to get smaller tube.

Which is it?

Re: Firmware 1.0.1 for the MMU2 unit

1-3 - drum doesn't move, moves weakly or only moves a little. Selector moves sometimes.

https://photos.app.goo.gl/w92FVdZwH4nVctdk7

Filming:
4th restart: Drum doesn't move, selector doesn't move.
5th restart: Drum doesn't move, selector twitches
6th restart: Everything works and I stop filming, taking this rare opportunity to PRINT!

I need to make to communicate that I'm trying the new firmware and I believe there are issues. I would REALLY like to hear that someone is listening on the other end, and that I could share my experiences in a way which could further development.

Re: Firmware 1.0.1 for the MMU2 unit

Hi jakub.d,

I did use the PTFE tubing that came with the MMU kit. Which works perfectly normal in single filament prints using petg and pla the tips are not troubling at all. The ever exhausting issue is during the transition of the filaments in mm prints, I have used the stock settings and slowly changed settings to see what works. I'm now trying Chris W (pretty pla mmu 1.2 settings) printing the sheep model which I have gone further but still got 3 jams at random with no error detected. the filament just grinds, the slightly larger tip passes the extrusion motor. during retracting I disconnect the orange PTFE tubing so I can snip the tip before it fully retracts it helps upto 2-3 transitions. Picture attached of lastest tips. so far iv lowered my temp down to 203 to help with that string but its printing the body of the sheep so I got a break till it reaches the ears and face.

Hi Rui,
thanks for the feedback, I will discuss this within our MMU2 testing group. However, I've noticed you have a different extruder motor. Is this the only part which isn't stock? What I've learned so far about MMU2 is that, it performance can be significantly influenced by using custom parts.

Re: Firmware 1.0.1 for the MMU2 unit

How do we make posts with suggestions where they will get read? The shotgun approach doesn't help people maintaining the list and it doesn't help the users.

Hi Khalil,
I have the same idea regarding the filament sensor and I intend to discuss it with them on Monday 😉

I have posted that exact idea here, on GitHub, under both printer and mmu, and gotten no response. I was hoping to get into why it wasn't done (presumably the unreliable optical sensor) so options could be discussed (people use an interstitial ball bearing of software filtering, and I suggested averaging as well)....

Hi Abraham,
GitHub is the best place to contact the devs directly. I'm scanning the forums, but the Git way is faster. In here we can discuss our experience and share our settings, etc. I'm sure your idea is noted, just our FW devs are very busy.

I asked support if I could buy a longer piece of tube (in order to skip the transition for the smaller ~2 cm piece above the optical sensor), and they said no. This should be an option!
When pressed for the dimensions, I was told the orange PTFE is 4mm OD, 2mm ID, making it larger than (for instance) Capricorn tubing and many others.
I was told NOT to get smaller tube.

Which is it?

I was referring to the hotend's tube which is 1.85 mm in diameter. I will make drawings for all PTFE tubes until the end of this week and make sure they are also listed on our eshop as spare parts. In case some tubes can be listed, I will recommend the manufacturer.

I need to make to communicate that I'm trying the new firmware and I believe there are issues. I would REALLY like to hear that someone is listening on the other end, and that I could share my experiences in a way which could further development.

Your feedback is heard, it just takes time to collect all the feedback, make it work, test it internally and then another run with our internal beta testers. For exact design/firmware suggestions I recommend to use GitHub and set an issue, it will inform the responsible dev directly.

Re: Firmware 1.0.1 for the MMU2 unit

Bonjour
Voila les réglage 41 heures d impression aucun problèmes de retrait du filament

2018-10-15.png2018-10-15 (2).png2018-10-15 (1).png

Salut Pascal,

Super ta config, je viens de terminer une impression en PLA 2 couleur, 7h40 d'impression sans aucun problème de filament.
A-tu fait des configs perso pour d'autres matériaux, PETG ou ABS ?

Cordialement.

Re: Firmware 1.0.1 for the MMU2 unit

I asked support if I could buy a longer piece of tube (in order to skip the transition for the smaller ~2 cm piece above the optical sensor), and they said no. This should be an option!

I was referring to the hotend's tube which is 1.85 mm in diameter. I will make drawings for all PTFE tubes until the end of this week and make sure they are also listed on our eshop as spare parts. In case some tubes can be listed, I will recommend the manufacturer.

If the PTFE could be sold in 500 mm lengths, even unfinished, I think it would work for everyone. Then again, redesigning the kit so the next gen parts just use the alternative feed through would be better still!

Your feedback is heard, it just takes time to collect all the feedback, make it work, test it internally and then another run with our internal beta testers. For exact design/firmware suggestions I recommend to use GitHub and set an issue, it will inform the responsible dev directly.

Thank you for this, it is easy to understand how there can be too much work to be done, but it is frustrating to sit in front of a functionless printer for days on end without hearing "yes/no/later". I am sorry if I get too insistent.

Re: Firmware 1.0.1 for the MMU2 unit

I understand that, we had a discussion about this yesterday, we will make changes to make the response time shorter.

Re: Firmware 1.0.1 for the MMU2 unit

I was referring to the hotend's tube which is 1.85 mm in diameter. I will make drawings for all PTFE tubes until the end of this week and make sure they are also listed on our eshop as spare parts. In case some tubes can be listed, I will recommend the manufacturer.

If the PTFE could be sold in 500 mm lengths, even unfinished, I think it would work for everyone. Then again, redesigning the kit so the next gen parts just use the alternative feed through would be better still!

I'm looking forward to receiving my MMU 2.0 next month... 😀
Please consider having raw 1.85mm hot end PTFE tube in the shop for us that likes tinkering and improving parts. It could be a fixed 1m length - or have a reference to a source selling the correct type for use in hot end.

I have been looking all over for a source of 1.85mm tube, but only finds 2mm ID...

I think it is in the spirit of Open Source to have the opportunity to modify and experiment with improved designs... 😉

Re: Firmware 1.0.1 for the MMU2 unit

I would like to chime in and say I am having MMU bootup issues as well. Seems like it doesn't complete the startup sequence correctly 100% of the time with the new firmware, never had this issue with 0.9. The selector moves to the right and just forgets to move left, theres no lead screw debris or resistance so I am not sure what is going on. Sometimes it works fine.

Re: Firmware 1.0.1 for the MMU2 unit

I would like to chime in and say I am having MMU bootup issues as well.

Can you please upgrade to 1.0.2 and if the issue persists tape a video? Thanks 😉

Re: Firmware 1.0.1 for the MMU2 unit

New FW 1.0.2 is out, mostly for the MK2.5+MMU2 users:
https://shop.prusa3d.com/forum/general-discussion-announcements-and-releases-f53/firmware-1-0-2-for-the-mmu2-unit-t25344.html

Re: Firmware 1.0.1 for the MMU2 unit

I would like to chime in and say I am having MMU bootup issues as well.

Can you please upgrade to 1.0.2 and if the issue persists tape a video? Thanks 😉

Are there any changes which would help stability? I'm on 1.0.1-126 and understood there to be no salient difference for my Mk3.
As far as reliability, the MMU has gotten worse with each release since 0.9.0 where it booted reliably every time. There are other upgrades but the days of hitting print and walking away are over.

If things might be getting better, I wait with bated breath.