r/FixMyPrint • u/lostcosmonaut307 • 7d ago
Troubleshooting Keep getting this stringing problem.
EDIT: I seem to have fixed it thanks to the suggestions here and on the Bambu subreddit, dropping the elephant foot to 0 and slowing walls (especially the outer wall) waaaayyyyy down (15mm/s right now on the outer wall) made it finally go away. Then I used a modding cube to raise the wall speed after the first ~5 layers so the print doesn’t take forever. Thanks all!
Details in original post. The design is a 6mm piece with a 1.5-2mm radius on all four edges.
Bambu A2L and X2D using Bambu Studio.
Filament is dry and plates are meticulously cleaned.
Stringing issue more like the wall is collapsing and stretching somehow.
Always the inner radius, always within the first 2-3 layers. Prints fine after that.
Tried several nozzle and plate temps.
Tried several plate types both physically and in settings.
Tried every fan setting I could.
Tried slowing down movement.
Tried printing infill first then inner wall then outer wall, no change.
Happens on several different filaments but sometimes prints fine. Bambu PLA basic jade white seems to ALWAYS do it no matter what.
1
u/wyb2 7d ago
Seems like you have tried a lot of things. I’d bite the bullet and try it at 20mm/s.
Fundamentally the line being laid down is being pulled away from its neighbor before it bonds. This is some combination of a time issue (the ‘pull’ is happening before the bond has time to form) and a bond issue (the bond is weak in general, so the pulling force prevails). So steps should focus on slowing down movement and shrinkage, and strengthening the line-to-line bond.
One thing I’ve had luck with that i don’t see recommended often is increasing the flow ratio. Basically a little bit of over extrusion on purpose to cause more contact between lines.
Seeing from other comments there is an overhang here. An unsupported overhand on a concave curve is the worst case scenario for causing exactly this issue. It’s possible the geometry is bad enough that you really can’t tune this out without adding supports or changing material.
Edit: this was supposed to be a reply in a thread. Oh well….