Bambu lab x1c using Bambu Studio
I’ve encountered a problem in this Knitted Snowman model that I downloaded from Maker World. These lines/blobs appear more in the lower half of the snowman’s body. Few if any occur near the upper half. I have adjusted the speeds from the default PLA and changed the walls from Classic to Arachne. I have calibrated the filament INLAND PLA + WHITE. Filament has been dried. My efforts have seemed to define this defect even more. Seam is in back, Inner/Outer, Infill 5% Gyroid, Print by layers. These blobs are consistent, occurring in the same spot in this “knitted” pattern. Are they a gap infill or overhang walls? Is this a retraction issue? I am familiar with 3D printing since building an Ender 3, investing more money than I care to admit (could have bought an X1C). This Bambu machine was a gift and quite a blessing. I have printed many other models on it like Toy Santa’s, cats, dogs and wall art etc but I have never seen this before. This defect even occurs in the Snowman’s head, same areas and levels. I have scaled this model down 50% and the defects are still there. These were supposed to be Christmas presents…alas Santa will be a wee bit late. Hopefully someone can recognize this and guide me in the right direction. I would be very grateful!
Have you tried slowing the print down? It looks like a little over-extrusion at the lower side of the “knit chain”. Where it has to jump over the air gap. Also visible in the top side of the buttonholes.
Oh yes, as stated I did slow the speeds down. You can see the speeds in the print profile I included. Perhaps I should slow them down even more? When you visit maker world there are many instances of this print by others but you can’t see the problem areas. I wonder if others had this problem? It can be cleaned up with an exacto blade and a brass brush but it takes an hour and I have slipped too many times with the blade, donating copious amounts of blood
These “tails” are strands of filament that were extruded before the nozzle was actually in place to start extrusion.
I know it’s kind of a tired meme at this point, but this is an oozing problem more than likely caused by wet filament. It gets better towards the top because that’s filament that’s deeper down in the spool, it maybe hasn’t absorbed as much moisture. Or the travel distances are shorter near the top so the filament doesn’t have as much time to ooze.
If your filament is dry, then PA calibration is way out.
I am using a Sunlu S2 filament dryer. It’s humidity indicator is always way off. I’m afraid to bake the filament to a crisp. In this model I checked all three boxes in the Print pop-up window, one of them being "Flow Dynamics Calibration. I’ve read where checking this box invalidates the K value that I set for this filament. I have tried printing this model with this box checked and unchecked and it made no difference. I will recalibrate this filament again but first I will dry it till it reads below 10%. Thank you everyone for your replies. I promise to get back once I find a solution.
