I tried lowering down the overhang print speed to 10mms and it dies not help at all. The problem is that sometimes it prints it ok and somehow without knocking of the Print but sometimes like today it knocked off even the Front cover of the Hotend.
Tried also to lower the overall speed, tried to make it faster, calibrated the Filament flow and the PA both are ok.
Anyone else had this problem and could get it right?
I have a similar problem that I have been working through.
You do not give and details about settings, or even type of filament so it is hard to be specific.
I can give you some generic things to try.
if your model has infill, make sure to choose an infill pattern that does not overlap on the same layer. Grid does and it makes bumps that stick up. Try rectalinear or gyroid instead.
make sure that you have enough cooling.
there are many possible causes for the bumps at the tips. Things that I notice in the photo: the overhang shows a distinctive stair step pattern. This could be that your layer height it to high (adaptive layers could fix that) or your overhang angle is too high (45 degrees is a good max without supports) and yours looks like about 65 degrees.
You could also just be overextruding because your filament flow and pressure advance are not tuned correctly. Even filament temperature could be off.
I assumed this would be a problem that is best mitigated with the “Wipe while retracting” in the retraction area. Never used it myself, but you can test it quickly by sinking the print into the bed and only slicing the section that causes the issue.
Wipe while retracting - Moves the nozzle whilst retracting so as to reduce the chances of a blob forming.
Do not expect better results with the other nozzle sizes. BBL has tuned the .4 to make sure the printers work great during the first experience. My attempt to use the .6 nozzle on my P1P was bad enough that I decided to wait until I had time to try and create a good profile for it by myself.
Was there any other difference from the good to the bad, except the color change?
No. There was no difference i printed them in white also but suddenly more and more blobs on the corners and it really looks like they are curling up. This was one of the green that had no curling or less but a lot afterwards had it
I ordered now the Aux fan to check if its due to the cooling because the one thing that changed it the room temperature.
I believe you’ll have to change your z-hop so that it lifts the nozzle when it reaches the thin end of the run, as it looks to me like the melted filament is drooping when there’s little below to support it and the hot nozzle is dragging back over it.
A small update on this one. I have maybe found the reason why this happened. I have changed the feet from Anti vibration damper again to the stock feet and now I see no or 95% less of this happening so it could be the cause. Will post more if I can be sure about it.
