#Weird extrusion on X1C

1 messages · Page 1 of 1 (latest)

gentle cliff
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So recently tried out the 0.2mm nozzle on my x1c and was having some problems with the filament getting atuck in the extruder and needing the whole thing taken apart to get at it, but thats a whole other story.

My problem is that ive switched back to the 0.4mm nozzle, I have printed with it fine for 1000+ print hours, and upon switching it back to it, now my prints are all weird and not extruding correctly as shown in the attached pictures, they aren't nice like the first layer and seen uneven.

I have taken apart and put back together in accordance to Bambu lab instructions and have no leftover or missing parts. Is there any sort of print setting that I might have forgotten to change back? I even did a manual flow calibration as well before and after, but it is still happening. What could have happened? What can I check?

20250706_051947.jpg 20250706_051957.jpg 20250706_052002.jpg 20250706_070301.jpg
cedar umbraBOT
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AI Help

It sounds like you may be experiencing some issues with filament flow or nozzle clogging. Here are a few steps you can take to troubleshoot the problem:

  1. Check your filament diameter setting in your slicer software. Make sure it matches the actual diameter of your filament to ensure the proper amount of filament is being extruded.

  2. Check the nozzle for any leftover debris or clogs. Even a small amount of residue can affect the extrusion. You may need to clean the nozzle thoroughly using a nozzle cleaning needle or a cold pull method.

  3. Check the extruder gears for any wear or damage that could be affecting the filament feed. Make sure the gears are clean and properly gripping the filament.

  4. Check the extrusion temperature. If the temperature is too low, the filament may not melt properly and cause issues with extrusion. Make sure you are using the recommended temperature for your filament type.

  5. Check the extrusion multiplier setting in your slicer. This setting adjust...

WARNING: This response is AI generated and may contain errors.
flint flame
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Never had that on my X1C

gentle cliff
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I can for sure see if it needs some cleaning, and i kind of have been thinking about replacing it with a metal one, do you think that is a good idea?

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The other thing I can think of is maybe the secondary feeder roller spring screw might not have been 100% tight as it can be. Don't know if it needs to be pretty tight or not, so it was like 95% in, still clears the housing, do you think i should make it all the way tight again

flint flame
flint flame
cedar umbraBOT
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abstract lion
ripe pagoda
cedar umbraBOT
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gentle cliff
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Ill look at flow rate when I get back to using the .2mm nozzle, but for now I switched back to my .4mm nozzle and was having that weird extrusion problem. Drying it isnt and issue, all my filament sit together in the ams with lots of dessicants after they are dried. This is a consistent problem, I even did a full price t of these things. This was not happening with my test print of these last week, nothing has changed filament wise

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This is a consistent issue, not irregular, its too uniform

ripe pagoda
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Why is is stringing then? 🤔
Is iring on?

cedar umbraBOT
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gentle cliff
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Left is .4mm nozzle normal woth ironing and right is .2mm nozzle woth ironing, it looks so much better, but its a singular print, I need to make 50 of these things. I just redid the manual flow calibration in Orca Slicer and it has basically fixed the problem, but I should do another full manual calibration with the .2mm nozzle and adjust the cubic mm flow volume, since it is much reduced compared to .4mm

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Is around 2mm³/s a good volume for a .2mm nozzle? Looking it up says around that is the max volumetric speed for that nozzle

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On .4mm nozzle in Orca Slicer it was at 15mm³/s

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Do you think my extruder just pushes the filament out too much and causes the filament to squish in the extruder, causing this to happen?

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gentle cliff
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Doing some rough calculations:

The .4mm nozzle prints just fine at 15mm³/s and the surface area of the opening is 3.14 × 0.4² = 0.5025mm².

The .2mm nozzle opening is 3.14 × 0.2² = 0.1256mm²

That would make the .2mm nozzle almost a fifth as much flow volume needed for the same amount of flow ratio, right? It is exactly 4x smaller flow volume according to those calculations, meaning i need to set it at 3.75mm³ or around there, but Bambu labs wiki says 2mm³/s works woth most filaments.

Should I do 2mm³/s like Bambu Lab says or should I try the 3.75mm³/s I calculated?

ripe pagoda
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start with the lower one, and if you get under extrusion, bump it up.
it automatically uses it to calculate overall speed of the print i think...

gentle cliff
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I gotta do another clean of fhe .2mm first nozzle uuuughhhh hahahaha

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Already did it once, but getting rearmed with better information now makes the idea of doing it better to me.

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Thankfully I have a hot air reflow station at my workbench so I dont have to use a lighter, worked good the first time with a thick sewing needle, but the ball end of the Allen key they supplied with the x1c that they use in the Bambu lab demonstration is probably better

gentle cliff
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I will start with 2mm³/s max volumetric speed and see how calibration on that look on the 0.2mm nozzle

cedar umbraBOT
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gentle cliff
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Welp it got to the first layer of the flow rate calibration just fine, but basically after that is just quit and got clogged, thank God the filament actually retracted this time after stopping the print and didn't get stuck like it did the last 2 times. The filament volumetric flow rate was set to 2mm³/s, the default material profile for generic pla is 1.6mm³/s

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I dont know if i tried it at 1.6mm³/s previously or if I changed it before, but at 2mm³/s here is what this one was set to. I set the print temperature ro 205c to see if it would prevent heat creep from making the filament soft in the extruder and become jammed, which thankfully it did not jam this time in the extruder, just in the nozzle

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Should I try it at 1.6mm³/s from the default print profile then? The thing is, it prints fine for a short bit, but then seems to eventually just stop extruding filament, like the filament gets soft enough to not get pushed down into the nozzle

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Would setting the print temp to 200c possibly help just a little more if it'd heat creep making its way into the extruder?

gentle cliff
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First layer went down fine, still thinking maybe it could be heat creep, but I want to know what anyone else might think it could be

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Another picture of the print bed of the flow calibration first layer and the little balls of plastic on the layers after

20250707_054536.jpg
cedar umbraBOT
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gentle cliff
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Print temp is 205c, 40mm/s first layer and 80mm/s all other layers and for walls and infill, 1.6mm³/s print volume, 10-30% min-max cooling fan speed

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So far second layer seems to have printed good, will post result to see if it worked on on the 2 pieces im printing right now, if so, I might have figured it out. Fingers crossed