Under-extrusion or gaps at seams with input shaper settings and 5.x firmware
 
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Under-extrusion or gaps at seams with input shaper settings and 5.x firmware  

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Scott Bierly
(@scott-bierly)
Eminent Member
RE: Under-extrusion or gaps at seams with input shaper settings and 5.x firmware

@_KaszpiR_ Well, remember I own two of these things, the characteristics and issues have been about the same. If you are a casual user, mostly printing PLA or PETG, you can go a long time without ever realizing any of these troubles. If you only print Ninjaflex, and try to keep your printers printing around the clock every single day...well, those are just two different things. But again, from my last post, Prusa markets the Mini for "FLEX" and for "advanced users looking to build a printing farm", even for nylon, ABS, and polycarbonate! 

The Mini is a lovely machine from a great company, keep your extruder and nozzle clean, and replace the hotend PTFE if mysterious underextrusion appears, and on basic filaments you should be a happy camper!

Posted : 28/01/2024 12:22 am
Shai Schnarch
(@shai-schnarch)
Member
RE: Under-extrusion or gaps at seams with input shaper settings and 5.x firmware

Hi,

I'm having the exact same problem (tried multiple types of PLA), downgraded to non input shaping :/

Hopefully this gets resolved quickly, other than this problem my IS prints look really good.

Posted : 08/02/2024 9:21 pm
Barclay
(@barclay)
Member
RE: Under-extrusion or gaps at seams with input shaper settings and 5.x firmware

FWIW, I was battling the seam gap problem (and perimeter to infill gap problem) with IS, and I've tried a bunch of the solutions people have posted here and elsewhere.  I was using some Kulannder nozzles off amazon (cheap enough they were probably some Chinese knock-off).  I ordered some proper e3d nozzles, and with the default settings, both the seam gap and perimeter-to-infill gap problems are 95% gone using default prusa settings.  If you tweak the extrusion multiplier a touch, it's perfect.  In this video:  the creator mills some of his cheap nozzles in half, and you can see that the interior channel isn't smooth, but wavy.  I suspect my cheap ones are similar, and I'm guessing that the increased pressure and flow rates requires for IS mean that artifacts from uneven flow are magnified, resulting in the problems I was having.  

Anyway, if you have these problems and aren't using quality nozzles, you might want to try ordering some OEM or other high-quality nozzles, and see if that helps.

Posted : 02/03/2024 6:21 pm
mark
 mark
(@mark-3)
Reputable Member
RE: Under-extrusion or gaps at seams with input shaper settings and 5.x firmware
Posted by: @barclay

FWIW, I was battling the seam gap problem (and perimeter to infill gap problem) with IS, and I've tried a bunch of the solutions people have posted here and elsewhere.  I was using some Kulannder nozzles off amazon (cheap enough they were probably some Chinese knock-off).  I ordered some proper e3d nozzles, and with the default settings, both the seam gap and perimeter-to-infill gap problems are 95% gone using default prusa settings.  If you tweak the extrusion multiplier a touch, it's perfect.  In this video:  the creator mills some of his cheap nozzles in half, and you can see that the interior channel isn't smooth, but wavy.  I suspect my cheap ones are similar, and I'm guessing that the increased pressure and flow rates requires for IS mean that artifacts from uneven flow are magnified, resulting in the problems I was having.  

Anyway, if you have these problems and aren't using quality nozzles, you might want to try ordering some OEM or other high-quality nozzles, and see if that helps.

My machine is bone stock, everything from Prusa, except a silicone sock on the hot end to keep wayward filament from gumming it up. It definitely is showing this issue, even after calibrating IS and Extrusion multiplier.  I can look into if the nozzle is worn though. I have some pin gauges.

Regards,

Mark

Posted : 03/03/2024 6:59 am
Shai Schnarch
(@shai-schnarch)
Member
RE: Under-extrusion or gaps at seams with input shaper settings and 5.x firmware

My machine is also stock :/

Posted : 06/03/2024 6:36 pm
Prusb
(@prusb)
Member
RE: Under-extrusion or gaps at seams with input shaper settings and 5.x firmware

I have the seam as well 🙁 I love the speed but I also have visible layer lines. At first I thought it was the x or y belt tension but it hasn’t improved after tightening. I do hear the extruder some times so that’s my main suspect for the lines. The seam is something else I think?

Posted : 27/03/2024 9:30 pm
Scott Bierly
(@scott-bierly)
Eminent Member
RE: Under-extrusion or gaps at seams with input shaper settings and 5.x firmware

Am I missing something here, I very much need to edit my prior post, but don't see anyway to do so. Thus, I must rattle on deeper in the thread, and my misleading old words will live on forever for google to scrape and hand to the TLDR crowd. Anyway....

1) Apologies that I inadvertantly split this thread into slightly unrelated topics, but that's done, and I very much need to update

2) I wholeheartedly retract my prior statements about the Slice Copperhead hotend for the Prusa Mini. I had bought two, for upgrading my two Minis along with the Bondtech IFS upgrade, as a bundle from Slice. Immediately loved the new extruder, big improvement! But my intitial results were terrible with the Slice hotend, and I was keen to return them and started to do so. THEN...I did one last experiment, I replaced the poorly cut PTFE that came with it with a carefully measured replacement (just plain white PTFE!). Boom! It was not only immediately working, but the NinjaFlex print quality was through the roof gorgeous. Mirror-like side finish, and it just goes and goes and goes, I think the days of PTFE shrinkage and endless changeout are over, or at least more like an oil change than brushing your teeth 😉 I installed the second one on the other Mini, identical results. Very happy with these two upgrades, they both print like a dream now.

 

Posted : 29/03/2024 2:45 am
_KaszpiR_ liked
Shai Schnarch
(@shai-schnarch)
Member
RE: Under-extrusion or gaps at seams with input shaper settings and 5.x firmware

Anyone from prusa who can help? We really want to you IS but as it is right now it's unusable...

Posted : 29/03/2024 7:33 am
mark
 mark
(@mark-3)
Reputable Member
RE: Under-extrusion or gaps at seams with input shaper settings and 5.x firmware

Prusa Slicer 2.7.3 seems to be a little bit of an improvement. I also used z ramping travel. There was still some fine stringing but easy to scrape off. Seams are better.

Regards,

Mark

Posted : 01/04/2024 6:42 pm
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