I’ve been having a lot of issues with overhangs that I’ve just come to accept, but this one in particular has me stumped. On over hang corners (like to bow of benchy) instead of sagging like I would expect from a failed overhang, it looks kind of shrink-wrapped or sucked in instead. I’m looking for any advise on what is causing this.
I’m using Bambu PLA matte filament on a P1S. I dried the filament before printing.
Slowing down the print doesn’t improve things much as you can see in the photo below. The test cube on the left is with the default profile speeds, with the one on the right I slowed down the shell print speeds and overhang print speeds.
You can ignore the poor quality of the overhang from the circle-within-a-circle face for this post. I’ve just come to accept that face is the most difficult and I will probably not get a clean print of it. Overhangs seem to be such an issue for this printer.
That sucks. Have you checked to make sure the fan is blowing full speed during overhangs?
Another issue that it could be that the minimum layer cooling time (I forget if that is the exact wording for this) may need to to be extended.
Do you have an enclosure on your printer? If so, make sure to leave the door and top glass open. If it stays too hot in the chamber, PLA can do that.
One last thought would be to try the same files with a different filament just in case the filament is the issue. Though likely that is not it. It’s worth a try.
You may also want to not even bother printing the top half of these models while testing. It would save time and filament to keep testing until the bottom half looks good, then print out the whole thing.
The part cooling fan is at 100%. The Axillary and Exhaust fans are at 70%. I’m not sure I understand fully the effects of the last two.
I haven’t tried printing with the door open. I’ll try that!
The problem seems to be only with Bambu filament (matte and basic). The Protopasta and Prusament filament doesn’t really have this problem or at least to a far lesser degree. All filaments I’ve tried are PLA.
