Hi..
Was searching the forum for solutions for issues with PETG-CF clogging and piling up on the Nozzle of my H2S. I found some posts, but many are older, and there are a lot of suggestions, but no one seems to have fund the perfect solution.
When i first got the printer, I able to print 9 of the parts with no issue, even without support, but then one day the material clogged up on the nozzle and destroyed the print.
I made a full calibration on the printer, put in a brand new 0,4mm hardened steel nozzle. Made all the flow tests on the material, so it should adjusted perfectly. Dried the filament for 8H in the HT AMS.
Then I tried to print just 2 parts with “print by object” and support.
First one turned out okay, but second one is completely destroyed.
Has anyone found the perfect settings or solution for this?
I found suggestions for Slice Engineerings Plastic Repellent Paint, and will try that next, but I am getting a little frustrated, as the costumer is waiting for 20 of them.
Use a 0.6 mm nozzle, Arachne Wall Generator, and a layer height of 0.2 mm.
The parts don’t look complex, and a 0.4 vs 0.6 mm nozzle won’t make a difference. Save yourself the time and hassle and use 0.6 mm. Just because 0.4 mm should work, it’s not worth the stress in my opinion.
Issue is the other side of the part, that is not visible here in the pictures.
The part has an emboss of the customers company logo and name. Therefore it is necessary to print with 0,4mm nozzle and 0,16mm layer height, to meet the customers expectation.
What I don’t understand, is that I could print 9 of them at the same time before with no issues at all, and now I can’t even make 2, even if I make every effort to make sure that everything is 100%.
All filament with fiber has caused me problems even after just one day of machine inactivity with the filament left in the nozzle. Since I started purging and flushing with another material, I haven’t had any clogs anymore. Cold extraction with pet is mandatory after a clog.
are you sure you’re not over extruding ? what’s your factor for that ?
I use HT AMS, so it returns to the AMS after the print, and what ever is left in the nozzle will be purged before it prints again-
It never clogged up the flow trough the nozzle. Just build up all the way around it and inside the silicone sock.
I did the flow rate calibration in Bambu studio after drying the filament, to rule out over extruding.
Base of the support is still adhered to the print plate. I think the big blob of filament sags when the nozzle is not over the part, and knocked the support over and also damaged the print.
The 4 on the first pictures were printet without support.
He means do a cold pull after using fiber stuff. I would also do a few collpulls and see if prints normally again.
If you use the AMS, the filament is cut then pulled backup. So a piece stays inside the nozzle and if there is a fiber stuck, it will stay there. Only a collpull can get it out.
What brand of filament are you using? I would try a 0.6mm nozzle at 0.16mm to be honest. It shouldn’t matter a lot for the embossing if on a vertical plane.
I know, bwas with a brand new 0,4mm nozzle, so the rules out that it’s because of the nozzle, except if the new nozzle developed the same problem almost imidiately.
I have only used BL PETG-CF; but I am considering trying the one from Elegoo, as it can’t be much worse than this.
I ordered the Slice Engineerings Plastic Repellent Paint today. Might try that out with a 0,6mm nozzle, but as the lettering is in a quite narrow font, I dont think it will turn out great.
Petg cf from bambu ? I Print this on a1/p2s and h2s, with no Problems …. But only petg cf from bambu and all with 0,4 nozzle. But Flow rate is Only 88%. On a1 the other I Must Look…. Is your petg wet ? Or have you to much cooling? With to much Part cooling I have Lot of Problems with petg cf … I have go down and Than works Fine …
With standart I have the Same Problem , is normal with petg cf , After every Print I clean the nozzle. With Flow Cali and normal I Must use 87% … But I think on more for Layer liability… the original is to much …. Make a Flow Cali Test ! And clean After every Print, is normal with cf filament
I mean the cooling at the top when it closes the infill. If that’s too high, it messes everything up. That’s the problem I’m having. Then everything scratches and doesn’t come out properly. You need to lower the cooling for that. If you want, I can send you my settings.
I did the flow calibration already, before the second failed print. For mine te 0 one was the smoothest and most consistent of the samples, so it should be dialed in correctly, but I don’t remember what ratio came from that. I will look on monday when I go to work again.
I would be okay with cleaning after a print, if only the print would be okay.
Omg make the second Test and learn and Read how Flow Cali work… the First test is only meant as a rough guide. You Must make the second !Also, do not rely on the description provided by Bambu Lab for the test, but instead look up online or use AI to determine how the test actually works and how the lines should be interpreted correctly.
I did do both of the tests and the best sample was 0 on both tests. The second one was difficult to see the difference on, but followed the Bambu Lab instructions with a flashlight from the left side and looked for surface smoothness, and no gap between the lines.
The first plate from the FlowKali shows you where the lines are under-extruded. Between the lines you can clearly see the gaps, those small bubbles or missing material. In the second image you can see that the lines are closed. However, the second image is not exactly correct either, it is already over-extruded. Unfortunately, I could not find the plate to show you that.
You start from the bottom, where it is under-extruded. As mentioned, I had to go quite far down before I could clearly see it. Then you increase it step by step by one percent and check where the lines start to close. The plate where everything is fully closed and there are no more gaps is the correct one. If you go higher, it becomes over-extruded again.
, is normal with petg cf , After every Print I clean the nozzle. With Flow Cali and normal I Must use 87% … But I think on more for Layer liability… the original is to much …. Make a Flow Cali Test ! And clean After every Print, is normal with cf filament
