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MMU 2.0 Filament Sensor Cover for Pass-through Couplings  

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brian.c24
(@brian-c24)
Active Member
MMU 2.0 Filament Sensor Cover for Pass-through Couplings

If you have the MMU 2.0 and are interested in getting rid of the little white Teflon tube that nestles inside the filament sensor cover, then this new sensor cover will allow you to use a pass-thru coupling so the orange tube will reach all the way down to the sensor.


MMU 2.0 Filament Sensor Cover for Pass-through Couplings

This seems to work well for me as it eliminates a potential choke point that would sometimes result in the dreaded missed layer, but your mileage may vary, use at your own risk, etc, etc.

Cheers,
Brian

Posted : 04/10/2018 12:16 am
Peter L
(@peter-l)
Honorable Member
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings


If you have the MMU 2.0 and are interested in getting rid of the little white Teflon tube that nestles inside the filament sensor cover, then this new sensor cover will allow you to use a pass-thru coupling so the orange tube will reach all the way down to the sensor.


MMU 2.0 Filament Sensor Cover for Pass-through Couplings

This seems to work well for me as it eliminates a potential choke point that would sometimes result in the dreaded missed layer, but your mileage may vary, use at your own risk, etc, etc.

Cheers,
Brian

Nice idea!

Where can we get the pass-through coupling?

That little bit of white PTFE is a problem for sure.

The other thing I'd like to do is swap the orange bowden tube for transparent. It will make troubleshooting much faster if I can immediately see the state of the filament in the tube.

Posted : 04/10/2018 6:58 pm
AbeFM
(@abefm)
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings

My concern is that they enable the optical sensor at some point, at then you're blocking it!

Still, I'd have already done this if I'd had the model. I'll try it!

Edit: Link not working?? Post on Thingiverse?

BTW: I "solve" the PTFE problem with a bright light. It's ok but not great.

In practice, it's SO easy to unscrew that I just do that. Thank GOODNESS they thought to do a metal-metal connection there.

I maintain an informal list of San Diego, CA 3D printing enthusiasts. PM me for details. If you include a contact email and I can add you to the informal mailing list....
Posted : 04/10/2018 11:01 pm
brian.c24
(@brian-c24)
Active Member
Topic starter answered:
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings


If you have the MMU 2.0 and are interested in getting rid of the little white Teflon tube that nestles inside the filament sensor cover, then this new sensor cover will allow you to use a pass-thru coupling so the orange tube will reach all the way down to the sensor.


MMU 2.0 Filament Sensor Cover for Pass-through Couplings

This seems to work well for me as it eliminates a potential choke point that would sometimes result in the dreaded missed layer, but your mileage may vary, use at your own risk, etc, etc.

Cheers,
Brian

Sorry Here is the URL since the other one seems to have been randomly switched to a link of my own post:
https://www.thingiverse.com/thing:3129388

To the person who thought I was somehow blocking the sensor (not that the damn thing works anyway), this is not the case. The orange tube now goes as far as the little white one did, not past the sensor.

To the person that wanted a link to the couplings, any one with 10mmx0.75 thread should work, but here is a link to the one I am using:
https://www.amazon.com/gp/product/B01IB81IHG/

Cheers!

Posted : 05/10/2018 12:45 am
AbeFM
(@abefm)
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings

Awesome, thanks!!! And thanks for the info. One of the early developers HAD shoved his tube all the way in, and you don't forget a thing like that.

Ew.

Anyway, more seriously, thanks for posting. I was actually posting to tell you the end of my orange tube was already nicely relieved, and I feel if people try to "fix" theirs, they may ruin it. Perhaps a note to that effect would be useful on your Thingiverse post.

I'll try it out if my million year print ever finishes.

I maintain an informal list of San Diego, CA 3D printing enthusiasts. PM me for details. If you include a contact email and I can add you to the informal mailing list....
Posted : 05/10/2018 7:32 pm
AbeFM
(@abefm)
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings

On and working nice. Printed on in PLA by not paying attention, first.

Then I had to recalibrate my bowden length distance, down 44 steps on each.

I maintain an informal list of San Diego, CA 3D printing enthusiasts. PM me for details. If you include a contact email and I can add you to the informal mailing list....
Posted : 06/10/2018 5:42 am
brian.c24
(@brian-c24)
Active Member
Topic starter answered:
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings


On and working nice. Printed on in PLA by not paying attention, first.

Then I had to recalibrate my bowden length distance, down 44 steps on each.

Ah, yes, sorry - I forgot to mention that in my instructions. I added that step (and the fact that the orange tube may already be funneled) to my Thingiverse page. I hope your mega long print came out OK. I actually successfully printed in PETG today if you can believe it, and ABS before that. I'm trying a 17-hour 4-color ABS print now. I still don't trust this thing at all, but I'm slowly taming it little by little.

Posted : 11/10/2018 2:55 am
AbeFM
(@abefm)
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings

I found some rough edges in (my self printed) inlet, I cleaned them up just a bit and the new tube thing has been working well.

What HAS been annoying is that the tube is just BARELY long enough - it's genuinely tight at the far ends of the travel along X.

I want to replace the tube with a longer one to get the tube back to stock length, but am not sure what to use yet. Support says the stuff is 4mm od, 2 id. I was going to try the looser Capricorn stuff next.

I maintain an informal list of San Diego, CA 3D printing enthusiasts. PM me for details. If you include a contact email and I can add you to the informal mailing list....
Posted : 12/10/2018 8:19 pm
Martin_au
(@martin_au)
Reputable Member
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings

Lovely. I didn't realise these were a thing. I've ordered some now.

Posted : 14/10/2018 11:14 am
brian.c24
(@brian-c24)
Active Member
Topic starter answered:
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings


I found some rough edges in (my self printed) inlet, I cleaned them up just a bit and the new tube thing has been working well.

What HAS been annoying is that the tube is just BARELY long enough - it's genuinely tight at the far ends of the travel along X.

I want to replace the tube with a longer one to get the tube back to stock length, but am not sure what to use yet. Support says the stuff is 4mm od, 2 id. I was going to try the looser Capricorn stuff next.

I agree, this leaves the tube a bit short. I have three samples of new tubing coming, two from Amazon and one from McMaster-Carr. I'm betting the stuff I picked from McMaster should work well. They typically stock good quality industrial parts. In the mean time, I'm using these frame holders which mount the MMU2 horizontal instead of gangster-leaning back. https://www.thingiverse.com/thing:3117468

Cheers,
Brian

Posted : 17/10/2018 2:20 am
toaf
 toaf
(@toaf)
Noble Member
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings

trust McMaster-Carr 😀

I have a Prusa,therefore I research....
Posted : 17/10/2018 3:18 am
AbeFM
(@abefm)
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings

Keep us posted on the tube. I definitely had a lighter pushing force with the Magic Orange Wonder stuff.

If it works out, I have other printers on which to use it. This purge tower and constant resetting/jamming it really making me appreciate my dual nozzle printer more. 🙂

I maintain an informal list of San Diego, CA 3D printing enthusiasts. PM me for details. If you include a contact email and I can add you to the informal mailing list....
Posted : 17/10/2018 4:41 am
adam.h22
(@adam-h22)
Active Member
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings


I found some rough edges in (my self printed) inlet, I cleaned them up just a bit and the new tube thing has been working well.

What HAS been annoying is that the tube is just BARELY long enough - it's genuinely tight at the far ends of the travel along X.

I want to replace the tube with a longer one to get the tube back to stock length, but am not sure what to use yet. Support says the stuff is 4mm od, 2 id. I was going to try the looser Capricorn stuff next.

I have replaced the PTFE Tube on my MMU using this and it appears to be working well.

https://www.amazon.com/MUYI-Chemical-Electrical-Medical-Equipment/dp/B019PZ5MY4/ref=sr_1_14?ie=UTF8&qid=1539957292&sr=8-14&keywords=ptfe+tube+for+1.75mm+filament

Let me know your thoughts

Posted : 19/10/2018 3:55 pm
Peter L
(@peter-l)
Honorable Member
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings


I have replaced the PTFE Tube on my MMU using this and it appears to be working well.

https://www.amazon.com/MUYI-Chemical-Electrical-Medical-Equipment/dp/B019PZ5MY4/ref=sr_1_14?ie=UTF8&qid=1539957292&sr=8-14&keywords=ptfe+tube+for+1.75mm+filament

Let me know your thoughts

Wow, how long does it takes for the MMU to load filament through 10m of tube? 😆

But seriously...Is this stuff reasonably transparent? The one thing I'd really like is to have a transparent bowden tube so I can see whether there's strings, misshapen tips, etc.

Posted : 19/10/2018 4:19 pm
adam.h22
(@adam-h22)
Active Member
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings



I have replaced the PTFE Tube on my MMU using this and it appears to be working well.

https://www.amazon.com/MUYI-Chemical-Electrical-Medical-Equipment/dp/B019PZ5MY4/ref=sr_1_14?ie=UTF8&qid=1539957292&sr=8-14&keywords=ptfe+tube+for+1.75mm+filament

Let me know your thoughts

Wow, how long does it takes for the MMU to load filament through 10m of tube? 😆

But seriously...Is this stuff reasonably transparent? The one thing I'd really like is to have a transparent bowden tube so I can see whether there's strings, misshapen tips, etc.

It is pretty good. Here is an adapter i created to hold filament from my dry box and also acts as my take up.

https://www.thingiverse.com/thing:3162971

The bottom is the amazon tube the top is the Prusa tube. The take up is the space between.

Im happy with it but i wanted the MMU on my lack enclosure so i didnt give the Prusa Orange PTFE a try to be honest.

Posted : 19/10/2018 5:01 pm
AbeFM
(@abefm)
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings

After a little thinking:
The Prusa tube is fatter and significantly lower friction.

The ~1cm White tube is smaller diameter and nicely tapered.

I believe that is used to give smaller tips. I was using Capricorn tubing which is lower friction, and it printed ok, but I don't think it was helping. It was nice that it was clear, but not as nice as it jamming less.

I've since gone back to the original tubes, however I'm still using Brian's cover. I just bump the orange tube right up to the white one, eliminating air gap-brass-air gap transition from the OEM set up.

Right now I think this is the better way to go - a good compromise on constraints and tip shaping versus drag and transitions.

I maintain an informal list of San Diego, CA 3D printing enthusiasts. PM me for details. If you include a contact email and I can add you to the informal mailing list....
Posted : 19/10/2018 8:42 pm
brian.c24
(@brian-c24)
Active Member
Topic starter answered:
Re: MMU 2.0 Filament Sensor Cover for Pass-through Couplings


Keep us posted on the tube. I definitely had a lighter pushing force with the Magic Orange Wonder stuff.

If it works out, I have other printers on which to use it. This purge tower and constant resetting/jamming it really making me appreciate my dual nozzle printer more. 🙂

https://shop.prusa3d.com/forum/user-mods-octoprint-enclosures-nozzles--f57/here-is-a-possible-source-to-replace-the-orange-tu-t25336.html

Works great. Nice and clear too.

Posted : 23/10/2018 1:41 am
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