.6mm e3dv6 stringing petg any ideas?
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@deckingman said in .6mm e3dv6 stringing petg any ideas?:
@arhi Have you tried experimenting with the part cooling? More air, less air?
That is where I'm at.
Since I had to convert quickly my x-carriage to accommodate BMG as I had some troubles with my self-modified G5 the cooling was sub-par. I designed and printed the new one yesterday, it's ugly as hell but cooling is now great, I have 2 fairly strong 5015 blowers hitting the tip of the nozzle, high pressure, huge air volume, fine control (they go down to 5% and you can hear each %, I don't have good visualisation yet of the airflow, need to get me some of that oil railway modelers use for simulating smoke; on the other hand the water bowl test shows the good flow and high pressure).I just finished two prints and am not happy. With 100% part cooling fan difference to the poor cooling wrt stringing is negligible. I can't understand wtf is going on, this amount of cooling would prevent most of other PETG I have to even extrude at this temperature. I tested quickly the blue translucent one and the output is perfect, it's only this white thing that fails to run ok.
What's worse, the normal part suffer from too much retraction, and printing too bigger parts next to each other - no stringing, get small ones and everything falls apart even with this much air.
Here you can see what I mean .. both part that suffer from this much retraction and the darn strings... I'll drop the temp even lower but going below 220C for PETG makes zero sense to me... what kind of PETG runs @210 ?!?
Does it make any difference to the stringing?
I was sure the difference will be great, but, no, I'm observing no difference
I find that dropping the temperature to as low as one can get away with and using the highest possible travel speeds help.
Just going to let it print PETG @215C, makes zero sense to me to go that low for PETG but looks like I have 3kg spool of something that's filled with some additives. I expected to have to raise the temp up from 250 what I normally use for PETG due to larger nozzle and higher speeds but...
Does your slicer alow you to print smaller details at slower speeds? That can help too.
Not many details that I expect with .6 nozzle.
Anyhow, after I'm done with ideas wrt temp and cooling I'm 'bout to try to see how different speeds affect stringing. The move speed is now at 200, and this print it's going to go to 400 (can do now as replaced the huge e motor with pancake one)
But it might just be a function of that particular reel of filament. The "G' part of PET-G varies hugely between brands. Even the dye can have an effect. I once had to make some parts that had to be a "slide fit" dovetail joint. After a bit of experimentation, I got them to fit together just right and could print them all day long. But when I changed to a different colour filament (same type and brand) I had to adjust the clearances and re-slice. So if the filament dye can affect the dimensional accuracy, maybe it can have an effect on the "stringiness" too?
Well I just mentioned somewhere that "very white" and "super black" always behave for me different from all other colors. I suspect both use heavy dose of pigment that affect them a lot. Wife's father was a famous painter and he always corrected me that blues are not the most expensive and that good white is always the most expensive color in the set. I noticed all the "filled" filaments (metal dust, glow in dark, wood, carbon fiber...) are lot stringy compared to normal non-filled filaments, maybe the pigment that make this white does the same thing but I feel this type of stringiness is different. I did a lot of printng with PP and HDPE and this feels like those plastics. You cannot, with hand, break off the string from the nozzle, you pull and pull and pull and pull and like those magic color handkerchiefs coming out of clown's nose it just keeps coming out of the nozzle.
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hmmmm... this is weird behavior with 205C I'm getting over extrusion ?!?!?!?!
anyhow, dropping to 205C (how the hell petg prints at 205C beats me)
left to right
220C 200mm/sec move
215C 400mm/sec move
205C 400mm/sec moveM201 X1000.00 Y1000.00 Z150.00 E3000.00 M566 X500.00 Y500.00 Z100.00 E3600so jerk 500, acceleration 1000 (not sure what's the max speed it achieves on this short move between pilars)
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@arhi As you say - weird. Must just be weird filament.
Ref the railway modellers smoke - I use E cigs and make my own "juice". The ingredient that produces the visible vapour is vegetable Glycerine - that's probably the same stuff that railway modellers use. Check out YouTube videos on how to make a "smoke machine" using Glycerine. Something like a foil dish heated with a tea light candle or three works well.
I've managed to produce a lot a visible vapour but trying to visualise air flow is another matter altogether. You need a dark background and lighting is very tricky to get right.
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Have you thought of playing with temps a little bit more ?
I primarily use Das-Filament's PETG and I usually print the first layer at 230c then back to 225c after that with fan at 80% after layer 5.
But oddly this week i opened a new roll of PETG from Das-Filament "metallic blue" I popped it in the printer and ran it with my usual profile using S3D.
As soon as it started laying the first layer down it just didn't look right, lots and lots of oozing and stringing, I put it down to being a colour I haven't printed with before, with it being a supposed metallic.
But a few layers in and it didn't get any better and it just smelled wrong compared to what PETG normally smells like when it is printing if you know what I mean.
So I stopped the print and the material seemed very brittle and it was very crystalline.
So I fell back on to the usual diagnostic routine and started by checking it was dry (I dried it) nope still doing the same, then I printed a temp tower for PETG and all was showing far too hot, for a laugh I printed it again using a PLA set of G-code, this time the stuff printed as smooth as butter and the best temp showed to be at 190c .
Next thing I did was check it was actually PETG, as it was printing very much like PLA, the box and bag it came in all said PETG, I contacted Roman @ Das-Filament and he assures me it is 100% PETG.
But im at a loss as to why this particular roll of PETG wants to print at PLA temps.
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@deckingman great info, we'll see if I can get vegetable glycerine here. The lighting should not be a problem I have almost as much photo equipment as I have for 3d printers
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@CaLviNx said in .6mm e3dv6 stringing petg any ideas?:
Have you thought of playing with temps a little bit more ?
I'm open to suggestions, had to take a break for a bit. This overextrusion at 205C got me to the edge. Now back in testing mode. I'm almost ready to give up. The quality of the print parts is acceptable, no stringing issues unless doing torture tests and I do not plan to print Eifell tower with .6mm nozzle. Calling this filament "unusable for that type of printing" is acceptable end of the saga, but I will use up bit more time as I still did not use other slicers, only simplify3d. PS, IdeaMaker and maybe eve cura still need to have a go at it.
I primarily use Das-Filament's PETG and I usually print the first layer at 230c then back to 225c after that with fan at 80% after layer 5.
Too have mostly dasfilament pet'g in their xxl spools. Have some refills for the master spool (unfortunately, I do not plan to be getting those again, the master spool was a good idea but I'm not going to be using it after I use up the refils I have). Anyhow black, gray, translucaent (blue, green, red...) they all behave great, it's only this damn white that's causing me these problems.
I normally use 255-260 for the layer1 and drop to 235-240 for the rest of the print. But also, I normally use .2-.4mm nozzle (depending on the printer), 90C printbite bed, and 10-100% cooling (100% cooling for overhangs and bridges, 10% for the rest of the print, gradient 10-100% for small features if the layer time is below 15sec)
So I stopped the print and the material seemed very brittle and it was very crystalline.
This white one I have is actually more "soft" and "bendy" than most of the other PETG I have.
So I fell back on to the usual diagnostic routine and started by checking it was dry (I dried it) nope still doing the same, then I printed a temp tower for PETG and all was showing far too hot, for a laugh I printed it again using a PLA set of G-code, this time the stuff printed as smooth as butter and the best temp showed to be at 190c .
Next thing I did was check it was actually PETG, as it was printing very much like PLA, the box and bag it came in all said PETG, I contacted Roman @ Das-Filament and he assures me it is 100% PETG.
But im at a loss as to why this particular roll of PETG wants to print at PLA temps.
Holy f%$#&^##&(_@%# ... what are they putting in this PETG
.. I understand the major difference is the G part that everyone does differently but the reason one would use PETg is 'cause it has more temperature resistance than PLA. If it prints at 190C what's the Tg ? 60 like PLA ? or 70? Better to use PLA then, it's biodegradeable, stronger, smells nicer while printing, cheaper...I printed temp tower 260-220 yesterday and "all" of them looked, as you say, "too hot". But I was "scared" to go below 220C. This last test with 205C blew me away. I just broke the "stick" from the 205C test and it didn't delaminate, it broke like a solid stick would, perfect lamination ?!?!?!?!? at 205 + overextrusion, like it flown better at 205 than 230C ?!?!? dunno, I'll do now a tower 210 - 180
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top is 180 one before top 185C ?!?!?! (bottom 210, 5C step)
those two show signs that are not properly laminated, weekness... but it printed and laminated petg at 180C !?!?!? WTF .. the issue is with the bridge, but the "solid part" is strong even with 180C ?!?!?!? can't break off the 180C "cube" with my hands ?!?!?!? 180C PETG !?!?!!?!?!?!?!?!?!?!?!?!?!?!?! if someone told me I'd say they got mad or they got robbed and got PLA in PETG case ?!?
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@arhi There is another thread on these very forums about issues with PET-G. Some users have great success with certain brands. Other users report problems with exactly the same brand. I'm rapidly coming to the conclusion that there is huge variability between batches of the same brand. Or it might be different colours......
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@deckingman said in .6mm e3dv6 stringing petg any ideas?:
@arhi There is another thread on these very forums about issues with PET-G. Some users have great success with certain brands. Other users report problems with exactly the same brand. I'm rapidly coming to the conclusion that there is huge variability between batches of the same brand. Or it might be different colours......
Seen it. I'm starting to have fun now with this white "petg" from dasfilament .. if it was a standard 700-1000g roll I'd have more fun as 3kg roll was neither cheap nor easy to get to this godforsaken middle of nowhere but ... life
I'm giving up on the stringing fix for the white one, have enough parts to print where stringing is not an issue and .6 + speed = lot of stuff printed, aesthetics are not important here
