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mvikman
(@mvikman)
Eminent Member
RE: Stringing Issues

I kinda like that the priming line is left hanging from the plate tab, it's easy to remove, even while the print is running. They could make it an option to toggle priming line on tab or on plate...

Posted : 11/11/2023 3:43 pm
jF
 jF
(@jf-2)
Trusted Member
RE: Stringing Issues

Seriously.. there is no way the priming line hanging off is a bug. It reduces the amount of space needed to do the priming on the plate and makes it so much easier to remove those lines. I don't know how many times I ended up with a splitter of carbon fiber filament poking me under the thumb nail trying to scratch off those prime lines on the mini.

I would be seriously annoyed if they changed that back...

Posted by: @guyh

New beta version of PS. It seeks to address the stringing issues. My first test print looks much improved. Time for some further test.

https://github.com/prusa3d/PrusaSlicer/releases/tag/version_2.7.0-beta1

I'm so glad they fixed the filament selection menu. I don't know what they were thinking with the last firmware update, it was the worst. The scrollbar was too small to use, so you had to click and drag slowly to your filament and then there was so much padding between lines that prusament was way down the list if you enabled all available filament profiles.

Can wait to see how much it helps with stringing too lol

Posted : 11/11/2023 4:41 pm
xenon
(@xenon)
Trusted Member
RE: Stringing Issues

funny you think this is an oversight.

if you don't like it you can edit the start gcode so it starts on the tab, or on the plate somewhere. might tend to curl up more and stick to the nozzle, especially with petg.

Posted : 11/11/2023 6:49 pm
IPIND 3D liked
ssill2
(@ssill2)
Noble Member
RE: Stringing Issues

personally it feels like a bug.   and if you're printing with five filaments... there are only two tabs...  On my two MK4 printers, it start extruding as it lowers and lands on the plate.   this leaves a small tag of filament that's not stuck on the plate that you can use to pull the rest off.  Just feels unpolished to me.  like they forgot they put the tabs on the build plate.  Personal preference of course.

Posted : 11/11/2023 8:11 pm
ssill2
(@ssill2)
Noble Member
RE: Stringing Issues

And while we are talking about it.  Why when loading filament can't the move the tool to the front of the build plate.  TPU requires some extra help to get loaded correctly and it would be WAY more convenient if it moved the toolhead to the front.  I mean with tpu I already have to bypass the filament sensors on the side just to get it to feed smoothly enough.   and then shoving that soft filament through a few feet of bowden tube and past another filament sensor, it needs help lol

Posted : 11/11/2023 8:24 pm
the0bone
(@the0bone)
New Member
RE: Stringing Issues

Thanks Prusa for fixing it.

PrusaSlicer 2.7.0 beta is tackling that issue. By several steps they got it fixed. The major one that you can see during printing, is that the nozzle purge a bit into the tower before doing the Toolchange. That is similar to the G-code change, that was published on YouTube before.

I closed the report on Github as well.

Picture is 5.1.0-alpha2. Sliced with PS 2.7.0 beta. 0.2 Structural
All 5 Filament Profiles "Prusament PLA"
Loaded in
Tool 1 and 4 NX2 from Extrudr
Tool 2 and 3 PLA from Filament PM
Tool 5 Prusament PLA

Posted : 11/11/2023 9:48 pm
nhand42 and jF liked
jF
 jF
(@jf-2)
Trusted Member
RE: Stringing Issues
Posted by: @ssill2

personally it feels like a bug.   and if you're printing with five filaments... there are only two tabs...  On my two MK4 printers, it start extruding as it lowers and lands on the plate.   this leaves a small tag of filament that's not stuck on the plate that you can use to pull the rest off.  Just feels unpolished to me.  like they forgot they put the tabs on the build plate.  Personal preference of course.

You're describing exactly how it works on my XL... I don't think the 2 tabs are an issue, it does two on the left on my 2T XL and there is enough place to do 3 on the right for the 5T I'm sure. The MK4 has a more recent firmware currently, but the alpha firmware for the XL brings the XL up to date with the improvement of the MK4.

Posted by: @ssill2

And while we are talking about it.  Why when loading filament can't the move the tool to the front of the build plate.  TPU requires some extra help to get loaded correctly and it would be WAY more convenient if it moved the toolhead to the front.  I mean with tpu I already have to bypass the filament sensors on the side just to get it to feed smoothly enough.   and then shoving that soft filament through a few feet of bowden tube and past another filament sensor, it needs help lol

Alpha firmware also move the tool to the front here.. you need to update man.

TPU is indeed awful to load on the XL 🙁

Posted : 11/11/2023 11:24 pm
ssill2 liked
ssill2
(@ssill2)
Noble Member
RE: Stringing Issues

I'm not keen on loading alpha firmware in general doing the beta 2.7.0 and the matching firmware might be worth the update at this point.

 

Posted by: @jf-2
Posted by: @ssill2

personally it feels like a bug.   and if you're printing with five filaments... there are only two tabs...  On my two MK4 printers, it start extruding as it lowers and lands on the plate.   this leaves a small tag of filament that's not stuck on the plate that you can use to pull the rest off.  Just feels unpolished to me.  like they forgot they put the tabs on the build plate.  Personal preference of course.

You're describing exactly how it works on my XL... I don't think the 2 tabs are an issue, it does two on the left on my 2T XL and there is enough place to do 3 on the right for the 5T I'm sure. The MK4 has a more recent firmware currently, but the alpha firmware for the XL brings the XL up to date with the improvement of the MK4.

Posted by: @ssill2

And while we are talking about it.  Why when loading filament can't the move the tool to the front of the build plate.  TPU requires some extra help to get loaded correctly and it would be WAY more convenient if it moved the toolhead to the front.  I mean with tpu I already have to bypass the filament sensors on the side just to get it to feed smoothly enough.   and then shoving that soft filament through a few feet of bowden tube and past another filament sensor, it needs help lol

Alpha firmware also move the tool to the front here.. you need to update man.

TPU is indeed awful to load on the XL 🙁

 

Posted : 11/11/2023 11:27 pm
ssill2
(@ssill2)
Noble Member
RE: Stringing Issues

 

Posted by: @jf-2

Alpha firmware also move the tool to the front here.. you need to update man.

TPU is indeed awful to load on the XL 🙁

Ok I just updated the XL and one of my 2 mk4s.   going to do some tests today.

Posted : 12/11/2023 2:01 pm
ssill2
(@ssill2)
Noble Member
RE: Stringing Issues

The alpha firmware and new prusa slicer definitely improve things.

Posted : 13/11/2023 12:15 pm
ssill2
(@ssill2)
Noble Member
RE: Stringing Issues

As it turns out I also figured out the ninjaflex issue too.   I had the idler tension set too loose.   Based on this post, I did some adjustment.

https://forum.prusa3d.com/forum/postid/652146/

I basically started with the stock ninjaflex profile, including temperature, and the printed an xyz calibration cube.  I did several prints while increasing the idler tension each time until the print looked ok.  I did this on each of my two MK4 printers.   I'll now need to do the same on the each of the 5 extruders on the xl lol, fun

with the stock profile the ninjaflex doesn't string, I was just getting the underextrusion ans string because it wasn't getting pushed at the rate it was supposed to.

Posted : 13/11/2023 12:24 pm
Gryn
 Gryn
(@gryn)
Active Member
RE: Stringing Issues

I just got my XL 5 tool head.

Using the 4.7.x firmware, the only way I could get the blobs to be gone was to use the trick g-code below:

G1 E-1 Y350 F24000

(though you can put it as the first line of the tool change g-code rather than in the filament g-code).

The issue is 100% software, the blobs are coming from the tool change drips. However, I just downloaded the 2.7.0rc1 PrusaSlicer, and that completely fixed the issue. The new slicer puts the tool over the wipe tower before calling the tool change command, when the new tool returns, it just lands directly on top of the little line that the previous tool left in the air.

The print was 100% defaults and had virtually no stringing and zero blobs (there is a very small amount of wisping, but it's not even consistently there for the entire print).

----

Concerning the print not looking good (severe wobble). This is most likely due to your docks not being attached correctly to the bar in the back. I discussed this with techsupport and they shared a video showing how you make sure that the detent engages with the cut out in the bar. The trick is while tightening the dock you literally need to wiggle it forward and back until it engages.

So, if you have this issue, please loosen all your docks and make sure when you attach them again that they each engage properly to the bar.

----

Hope this helps. TLDR get 2.7.0rc PrusaSlicer! And check your docks!

 

Posted : 17/11/2023 12:49 am
ssill2
(@ssill2)
Noble Member
RE: Stringing Issues

I've not gone back and done any serious testing with ninjaflex on the XL but sainsmart works beautifuly at 214C.  I even did a two color print where it had to switch multiple times.   I have a spool of polyflex that needs tuning.  One weekend I might try to dial in the ninjaflex and polyflex a bit more on the XL.   Ninjaflex works pretty well now on my MK4 printers.  I could probably do a little tweaking and get it dialed in.

Posted : 17/11/2023 1:27 am
ssill2
(@ssill2)
Noble Member
RE: Stringing Issues

Ok I've done my first petg print with PETG.

It didn't turn out too bad, I had to correct the flow factor for the three filaments early on.  Two of them are Paramount3d PETG and one is Duramic.   Basicaly 97% seems to be the sweet spot, and 240 deg.   I have the 2.7.0 rc1 PS and 5.1.0 alpha(this morning I went to the beta).

There's still some more tuning I think but at least I'm not seeing the stringing.  I think the combination of the newest slicer and firmware sure help a LOT

Posted : 21/11/2023 2:41 pm
MME, GuyH and Asus1357 liked
Yazzman56
(@yazzman56)
Active Member
RE: Stringing Issues

Keep your filament dry. Petg and ABS are heat sensitive. I am building a enclosure for my XL but I have to print PETG parts. Well I was having stringing and clumping problems   when I realized I had my ceiling fans on! OOps!

Posted : 02/12/2023 4:47 am
Georg
(@georg-4)
Estimable Member
RE: Stringing Issues

Does anyone has a fix for the under-extrusion? I have a similar issue and opened a new topic on this with pictures attached:
https://forum.prusa3d.com/forum/original-prusa-xl-tool-changer-assembly-and-first-prints-troubleshooting/massive-under-extrusion/

 

Posted : 11/12/2023 8:02 pm
3dprintingrookie
(@3dprintingrookie)
Trusted Member
RE:

So what’s the general consensus now? Do we print at lower temperature or just update prusa slicer?

Posted : 26/01/2024 9:03 am
ntdesign
(@ntdesign)
Reputable Member
RE: Stringing Issues

I just did temp towers for the filament types I use. Most of my PLA seems to require lower temp and have a narrower range than Prusament. PETG as well but not as much. Most of my PLA works fine at 200-210°, PETG 230-235°. Temps are mostly consistent with what I knew from my Mk2.5s. I had only a single spool where drying really improved things (several years old Prusament PETG that was stored in the open), the rest was just temperature and/or flow multiplier (around -5% for matte and +5% for shiny filaments, but only in a few cases). I keep my filament in the dark in standard IKEA boxes with the dry pellets that come with filament.
I'm currently not using IS, for that I guess I'll need to repeat the exercise. The sample gcode is IS sliced and my results with anything other than Prusament were catastrophic (filament basically just dripped out of the extruder, temp way too high). Using latest Prusaslicer and profiles.

Posted : 26/01/2024 11:01 am
ssill2
(@ssill2)
Noble Member
RE: Stringing Issues

with latest slicer, firmware, non-IS profiles and .4mm nozzles   things are pretty good.     PLA tends to just work.   PETG also with the normal per brand modifications to the extrusion multiplier for most things that aren't prusament.  I have a couple brands of peg that work at extrusion multiplier of 1, but most require reduction to .98 or .97.  Paramount3d(for me) goes down to .96 to avoid blobbing, it always has, even on the MK3S.  TPU, depends on brand, but sainsmart I go to 227 from 230 stock and it mostly doesn't string.  Ninjaflex works fine at 238 but I have to lower the MVS to super slow(1.2) to avoid jams with some colors.

Posted : 26/01/2024 11:45 am
the0bone
(@the0bone)
New Member
RE: Stringing Issues

general consensus

Unfortunately Prusa did not managed to develop the Software during the time where the hardware had so many delay.
Meanwhile they corrected it and also figured out, that a fast Core XY printer do not need a 0,6mm nozzle to max out the extruder.

So Prusa updated the firmware and PrusaSlicer is making better code. For the people that already have the XL - that is the fix.
For all the people waiting: They also ship with 0,4mm Nozzle now to have less oozing.

And if you have yours, you can buy as well 0,4mm Nozzles (if they are on stock) and install it.

Posted : 26/01/2024 11:50 am
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