Material "curling" upwards right after leaving the nozzle

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reibuehl
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Material "curling" upwards right after leaving the nozzle

Post by reibuehl »

Hi all,

I noticed since a while that during priming at the start of a print, the material immediately "curls" upwards and sticks to the nozzle outside. I think this was not the case in the past. Is this a sign of nozzle congestion? I haven't printed any abrasive materials and the nozzle itself is fairly new - I did maybe 25-50 hours of regular PLA printing on this one. Any ideas?

Best regards,
Reiner
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Neotko
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Re: Material "curling" upwards right after leaving the nozzle

Post by Neotko »

Atomic pulls until everything is clean. That's the main source of that. Or, a coupler decaying making extra pressure (but not likely).
reibuehl
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Re: Material "curling" upwards right after leaving the nozzle

Post by reibuehl »

I did already do five Atomic pulls but then I will try a few more.

Do you have any recommendations for the temperature for the pulls? I used 90°C and PLA but I am unsure if this is correct.
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Re: Material "curling" upwards right after leaving the nozzle

Post by Neotko »

Depends on the brand and sensor. As long the pull looks perfect (so it took out everything inside) it should be ok.
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Re: Material "curling" upwards right after leaving the nozzle

Post by reibuehl »

The pulls seem to be too gummy but at 85°C I had similar results. I used to have nicer ones in the past where you could see the form better.
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Re: Material "curling" upwards right after leaving the nozzle

Post by reibuehl »

I currently use Material4Print PLA: https://www.material4print.de/de/pla-fi ... fos_-_184/
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Re: Material "curling" upwards right after leaving the nozzle

Post by LePaul »

I cool to 90C then pull on my Atomic Pulls
(Also whenever I remove filament from my Ultimaker 2, I use the Heat Up Nozzle to 200, then down to 90. Then I lift the feeder handle and yank it out)
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Re: Material "curling" upwards right after leaving the nozzle

Post by reibuehl »

I think I need to kick out my stock UM2 feeder again and get back to my previously used IRobertI feeder. With that one I did much more Atomic pulls like you describe when changing filament.
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Re: Material "curling" upwards right after leaving the nozzle

Post by LePaul »

The filament replacement process in the UM2 is just bad. I did it twice and both times it left 7 or 8 blobs up and down the bowden tube. That sucked to clean up
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Re: Material "curling" upwards right after leaving the nozzle

Post by Izzy »

I too sometimes get a curl up when priming, it can also vary with a change in temperature.
If I change material or colour I do an atomic pull always using a white filament and then I have a pull-through, ( I have a length of 1.75mm filament which is long enough to pass through the Bowden tube with 150mm to spare, to this I have glued a length of fine cord which has a loop at the end through which I fold a small length of paper towel) passing this through the Bowden tuble and pulling through the piece of paper towel or cloth, this cleans out any dust and bits before inserting a new filament.
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