Hello fellow withprinters. Whats happening here? Stringing is not the problem, if i print string tests, they are good. Its only in holes, the walls wont stick. Any suggestions for a fix?
Edit: Found the problem. The temperature sensor was faulty. Changed it and now everything is fine.
This is somewhat normal for FDM 3D printing. It’s a known behavior of filament in its molten state on the interior walls. As the nozzle goes around, it’s always at a tangent to previously laid filament, and can have the effect of pulling just-laid filament off of its bedding into the previous layer.
It’s one of those things that to fully understand I’d have to find one of the dissertations one of the community members did.
But with marlin firmware (using klipper right now) it worked…
Edit: Black is Marlin, white is klipper.
Different filaments will print differently, so it might not be the firmware
Doesn’t look like the same gcode though. Initial layer lines are facing opposite directions. You also have small brown inclusions in the white one, which is usually the result of burning/dripping filament from a leak.
Potential solutions:
- Coasting/Wiping before travel
- Linear Advance
- Tuning retraction
- Or completely side-step the issue by turning on “Avoid crossing perimeters”
The last one should really be default-activated. It avoids so much stringing and ugly outside surfaces.
In your second picture is your print upside down/bottom layer facing up? If yes, that’s “normal” slicer behavior for round things that end. You can trick your slicer into making those bridges by adding a 0.2mm high bridge - just make sure that it doesn’t touch the two walls and your slicer will generally not print floating perimeters. You can test this theory by looking at the sliced preview in your slicer.
I think ot looks ok. Font know how to add bridges in the slicer. Its not my design so i only have the .stls
What do you see in the preview in the slicer?
I bet those are movements across one part of the print to the other and for some reason it isn’t retracting enough before the movements.
Although you’d see some heavy stringing on a retraction tower test most likely if it’s that bad.
May be fixed with something like wall order or wipe during infill
Nope, it should be walls. They just wont stick. How does wipe during infill work? cant find anything in cura or google. I try changing the wall order now, thanks for the tip, could work.
Looks at the movement preview. See how the nozzle moves at those layers. But as another said those could be “fake” bridges added to allow sharp overhangs
Its just printing the walls, nothing unxpected. I changed the wall order like suggested in another comment and hope for the best.
