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Work in progress MMU2 Inland PLA profile  

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nuroo
(@nuroo)
Reputable Member
Work in progress MMU2 Inland PLA profile

1st the failures:


In the photos the Inland filament is green and blue

Inland is Microcenters in house brand, produced by eSun. Its price is $14.99 per kilogram. Inland is also locally available for me, so no shipping necessary.
I can normally on my MK3 print Inland PLA with default Prusa profile settings and get acceptable results. Perfect for fast or functional models where I dont need visual perfection, or I dont want to waste alot of expensive filament tweaking a model.

With the MMU2 attached this was not the case. I could not get a successful MMU print with inland pla no matter what I did, using the default Prusa pla profile, like with MK3 alone. My 1st successful prints were with Prusa supplied gcode and Prusa tested filament. (Prusa silver, Hatchbox black)

Like most filaments these days if you take the time to tune a filament profile - it prints very nicely for a cheaper brand. I started with Prusa PLA profile as a base and changed the following settings:
Filament Settings tab
Filament
First layer temp: 215c
Other layers : 195c
Advanced
Number of cooling moves: 3
Ramming settings:
Total ramming time(s): 3.50
Total rammed volume (mm^3): 24

The settings above significantly reduce stringing for Inland PLA. Stringing can be a major source of jams for the MMU2. These changes got me a complete print with no jams due to stringing.
What I've learned so far:
Reducing temps help reduce stringing by making the plastic less elastic. More ramming helps to better shape the tip of unloaded filament into a finer, narrower tip, so it can be reinserted during subsequent filament changes.

Inland - Yellow and green.

Prusa MK3 preassembled (R2/B6) > (R3/B/7)
Prusa MK2.5 kit > MK3 > MK3+MMU2 (R3/B/7) 😀
Prusa SL1 3D printer + Curing and Washing Machine (day1 order)
Taz6
CR10s4
Delta 3ku

Posted : 16/09/2018 7:06 pm
nuroo
(@nuroo)
Reputable Member
Topic starter answered:
Re: Work in progress MMU2 Inland PLA profile

Just an update:
Started playing with unloading speed at the start
So far:
below 75 = filament gets stuck in extruder and cant be retracted out during color changes
Default 100
Above 120 = Stringy tips

Current settings:
First layer temp: 215c
Other layers : 200c

Advanced
unloading speed at the start: 85
Number of cooling moves: 2

Ramming settings:
Total ramming time(s): 4.00
Total rammed volume (mm^3): 28

Prusa MK3 preassembled (R2/B6) > (R3/B/7)
Prusa MK2.5 kit > MK3 > MK3+MMU2 (R3/B/7) 😀
Prusa SL1 3D printer + Curing and Washing Machine (day1 order)
Taz6
CR10s4
Delta 3ku

Posted : 21/09/2018 1:11 pm
Colin
(@colin-4)
Estimable Member
Re: Work in progress MMU2 Inland PLA profile

Following along, since I use Inland. My MMU is still several weeks out, though. 🙁

Filament can be ordered from Microcenter.com with free shipping. Amazon occasionally carries it. I wish there was a Microcenter near me.

Posted : 21/09/2018 4:26 pm
nuroo
(@nuroo)
Reputable Member
Topic starter answered:
Re: Work in progress MMU2 Inland PLA profile


Following along, since I use Inland. My MMU is still several weeks out, though. 🙁

Filament can be ordered from Microcenter.com with free shipping. Amazon occasionally carries it. I wish there was a Microcenter near me.

I'd call it "functional" now - Successfully printed the test sheep.

I'll continue to tweak it for better filament tips. Hopefully by the time you get your mmu2, i'll have this profile tuned better.

Prusa MK3 preassembled (R2/B6) > (R3/B/7)
Prusa MK2.5 kit > MK3 > MK3+MMU2 (R3/B/7) 😀
Prusa SL1 3D printer + Curing and Washing Machine (day1 order)
Taz6
CR10s4
Delta 3ku

Posted : 21/09/2018 9:20 pm
nuroo
(@nuroo)
Reputable Member
Topic starter answered:
Re: Work in progress MMU2 Inland PLA profile

10 hour print - Inland PLA

No extruder jams, No load/unloads failures



Unloading speed at the start
Yellow: 90
Peek Green: 80
Grey: 80
Blue: 80
Darker colors look less stringy??

Functional for sure if no issues during a 10 hour print, but I still want better looking tips..

Prusa MK3 preassembled (R2/B6) > (R3/B/7)
Prusa MK2.5 kit > MK3 > MK3+MMU2 (R3/B/7) 😀
Prusa SL1 3D printer + Curing and Washing Machine (day1 order)
Taz6
CR10s4
Delta 3ku

Posted : 22/09/2018 4:03 am
Colin
(@colin-4)
Estimable Member
Re: Work in progress MMU2 Inland PLA profile

Looking good!

Have you tried any of the new Inland PLA+? I have a couple of rolls but haven't got into them yet.

Posted : 22/09/2018 4:07 am
toaf
 toaf
(@toaf)
Noble Member
Re: Work in progress MMU2 Inland PLA profile

thanks for doing the science, inland is nice for the price. I look forward to changing the settings when I get my MMU.

I have a Prusa,therefore I research.

Posted : 22/09/2018 4:25 am
nuroo
(@nuroo)
Reputable Member
Topic starter answered:
Re: Work in progress MMU2 Inland PLA profile


Looking good!

Have you tried any of the new Inland PLA+? I have a couple of rolls but haven't got into them yet.

I have tried inland pla+ on my other printers, it looks better just sure. But I haven't tried it on mmu2 yet.

Prusa MK3 preassembled (R2/B6) > (R3/B/7)
Prusa MK2.5 kit > MK3 > MK3+MMU2 (R3/B/7) 😀
Prusa SL1 3D printer + Curing and Washing Machine (day1 order)
Taz6
CR10s4
Delta 3ku

Posted : 22/09/2018 4:54 am
nuroo
(@nuroo)
Reputable Member
Topic starter answered:
Re: Work in progress MMU2 Inland PLA profile

Disregard this if only interested in Inland PLA profile. I wanted to print a mmu clown fish with Solutech3D filament. Thought I could get by with the default prusa mmu profile, nope.
Also tried purge to infill.... Decreased printing time. But not to nice for models with light colors, infill shows thru walls (yes i tried more perimeter walls). I wouldnt care on a functional part however.


Solutech3D - White
Solutech3D - Orange
Hatchbox - True Black

Solutech3D stringed, causing it to not feed into extruder. I've played with the advanced settings alittle as you can see from the photo above. Each set of tips is an adjustment in settings. Gonna try again to print this fish and then get back to Inland.

Prusa MK3 preassembled (R2/B6) > (R3/B/7)
Prusa MK2.5 kit > MK3 > MK3+MMU2 (R3/B/7) 😀
Prusa SL1 3D printer + Curing and Washing Machine (day1 order)
Taz6
CR10s4
Delta 3ku

Posted : 22/09/2018 9:35 pm
Paul Meyer
(@paul-meyer)
Honorable Member
Re: Work in progress MMU2 Inland PLA profile

Thanks for the inland posts, and keep us updated. I've got a bunch of MatterHackers Build series (their 'cheap' line, a bunch of colors I bought for the MMU2 at $20/kg), and it does string a bit and gave me issues with the pre-built gcode sheep. I've dropped the temp to 200 and resliced, which seems to be helping. I'm still seeing more stringing than I'd like, but I haven't had an unrecoverable error yet.

I've had three types of errors, only one causing print issues:
1) failure to unload at the MMU due to a string keeping the FINDA up (red flashy, easy fix)
2) failure to load at the MMU due to string (red flashy, easy fix)
3) failure to feed back into the extruder, as a string jams it below the extruder bearing (skipped layer, printer doesn't detect)

Posted : 23/09/2018 4:35 am
Paul Meyer
(@paul-meyer)
Honorable Member
Re: Work in progress MMU2 Inland PLA profile

Has anybody found a Slic3r option for turning off the heater during ramming? Or setting a lower temp target during ramming?

I wouldn't want to drop much, but 5 degrees or so seems like it would be a nice option to have. During unload/reload the tip would have plenty of time to get back to temp and stabilize.

Posted : 23/09/2018 6:14 pm
Paul Meyer
(@paul-meyer)
Honorable Member
Re: Work in progress MMU2 Inland PLA profile

I'm using your latest settings as a starting point for my Matterhackers Build testing.

When you increased the Ramming time to 4.0s, did you leave the default curve shape? I notice it peaks between 3/3.5 and drops off. That 4s shape may be there for a good reason, or Prusa does all their work at 2.5 and the shape past there is random.

I'm leaving the shape for now, we'll see how it goes.

Posted : 23/09/2018 6:38 pm
PJR
 PJR
(@pjr)
Antient Member Moderator
Re: Work in progress MMU2 Inland PLA profile


Has anybody found a Slic3r option for turning off the heater during ramming? Or setting a lower temp target during ramming?

I wouldn't want to drop much, but 5 degrees or so seems like it would be a nice option to have. During unload/reload the tip would have plenty of time to get back to temp and stabilize.

This is exactly what I do, plus increase the temp by 3 degrees at the start of the purge and print temp about half way through purge.

There are a couple of issues; Slic3r does not have facility to do this, so it has to be included in G-code sections and there is too much under/over shoot with a 40W heater (even with a good PID calibration.

So I switched to a 30W heater (plus sock) and slice with KISS.

Peter

Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…

Posted : 23/09/2018 8:48 pm
nuroo
(@nuroo)
Reputable Member
Topic starter answered:
Re: Work in progress MMU2 Inland PLA profile


Thanks for the inland posts, and keep us updated. I've got a bunch of MatterHackers Build series (their 'cheap' line, a bunch of colors I bought for the MMU2 at $20/kg), and it does string a bit and gave me issues with the pre-built gcode sheep. I've dropped the temp to 200 and resliced, which seems to be helping. I'm still seeing more stringing than I'd like, but I haven't had an unrecoverable error yet.

I've had three types of errors, only one causing print issues:
1) failure to unload at the MMU due to a string keeping the FINDA up (red flashy, easy fix)
2) failure to load at the MMU due to string (red flashy, easy fix)
3) failure to feed back into the extruder, as a string jams it below the extruder bearing (skipped layer, printer doesn't detect)

yes #3 is a killer - this has to be caught before a layer skip or print ruined
There is github issue highlighting this and some other issues.

https://github.com/prusa3d/Prusa-Firmware/issues/1163

PavelSindler commented 3 days ago
"Thank you for these information. We will look on it closer."

As for the filament sensor is it's unreliable, so its disabled when using mmu2. So the only way to prevent this is a well tuned, resistance free filament path + perfectly shaped tips so extruder always catchs the filament.

But there are not great profiles for every filament, and every1 isnt going to have a well tuned printer or know how to troubleshoot mmu2.

When you increased the Ramming time to 4.0s, did you leave the default curve shape? I notice it peaks between 3/3.5 and drops off. That 4s shape may be there for a good reason, or Prusa does all their work at 2.5 and the shape past there is random.
I left the graph alone. Only increased or decreased ramming time, so for.

Prusa MK3 preassembled (R2/B6) > (R3/B/7)
Prusa MK2.5 kit > MK3 > MK3+MMU2 (R3/B/7) 😀
Prusa SL1 3D printer + Curing and Washing Machine (day1 order)
Taz6
CR10s4
Delta 3ku

Posted : 24/09/2018 5:29 am
nuroo
(@nuroo)
Reputable Member
Topic starter answered:
Re: Work in progress MMU2 Inland PLA profile

Sadness......I thought i had Solutech3d good to go.....

Prusa MK3 preassembled (R2/B6) > (R3/B/7)
Prusa MK2.5 kit > MK3 > MK3+MMU2 (R3/B/7) 😀
Prusa SL1 3D printer + Curing and Washing Machine (day1 order)
Taz6
CR10s4
Delta 3ku

Posted : 24/09/2018 5:58 am
AbeFM
(@abefm)
Member
Re: Work in progress MMU2 Inland PLA profile

Thanks for the settings! Right now I'm having worse problems with my Prusa Silver I got half a year ago, moreso than the Inland. But I'm running both and curious to try them.

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 : 26/09/2018 11:53 am
Chris Riley
(@chris-riley)
Active Member
Re: Work in progress MMU2 Inland PLA profile

Have you tried inland red? These settings seem to work just fine for all of it except the red. Not sure what is wrong with it. It's really stringy on the tip.

http://youtube.com/ChrisRiley
Posted : 28/09/2018 8:49 pm
toaf
 toaf
(@toaf)
Noble Member
Re: Work in progress MMU2 Inland PLA profile

I hear red is hard to dial in. maybe something in the pigment.

I have a Prusa,therefore I research.

Posted : 28/09/2018 9:01 pm
PJR
 PJR
(@pjr)
Antient Member Moderator
Re: Work in progress MMU2 Inland PLA profile


I hear red is hard to dial in. maybe something in the pigment.

FWIW, I use filaments from 4 different manufacturers and a range of colours for each. I use the same settings for all PLA filaments.

Peter

Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…

Posted : 28/09/2018 9:09 pm
Chris Riley
(@chris-riley)
Active Member
Re: Work in progress MMU2 Inland PLA profile

Peter,

I have seen some of your settings on other posts. Is there a screen shot some where I can copy them down? I would love to give them a try.

http://youtube.com/ChrisRiley
Posted : 28/09/2018 9:16 pm
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