Stringing?

Bambu Lab P Series Troubleshooting
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Hi all,

I am new to this and I am hoping for some help. I designed and printed my jar lid and i get the strings? in the upper layers (last 7mm not the base and first 7mm) see attached pics. Using a p2s and bambu pla basic filament, 0.4 nozzel , default printer settings, have done filament drying.

I am not sure where to start. What do your call this defect, and where do i start / look at to fix it. It looks like the feed has hooked back on itself, seems only to effect the thread protusion not the body.
Kind regards Stu

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Welcome to the forum.

Printing threads can be difficult. The combination of overhangs on the threaded section and that the feature is an internal radius is what’s causing the stringing issue. Printing interior round features is harder because the outside wall of the thread doesn’t have anything to support or bridge between. If the outer thread wall fails early it will compound the issues as the thread forms.

Depending on the thread, lowering the layer height at this feature can help with the overhang issue.

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Thanks for response Jon,

What do you mean by layering height. Is that in my design or in printer or slicer settings. ( I created the design in freecad couldn’t see how to do in bambu software so learning freecad - wound a D profile around a helix attached to cylinder), and then exported and uploaded and sliced and printed using bambu studio software.

Steep learning curve software and printer , fun , exciting and difficult all at the same time

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By layer height I’m referring the the amount the slicer instructs the printer to lift the print head each pass. Tall layer heights print parts faster while shorter layer heights complet the print slower but with more detail.

I’m not sure if you have seen this before but the Bambu wiki has a lot of good information regarding printing and the issues one might encounter

Here is the link to the page about layer heights and how adjusting them can help print problematic parts.

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Thanks Jon for that info

I shall chase that path, and continue my education. I did find some wiki’s, but was lacking the knowledge of which/where to start. Your explaination helps :+1::folded_hands::slightly_smiling_face: . I will give it a go and let you know.

In appreciation

Stu

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Back in the old days first thing I would try is stand it on end. I would use a brim and supports. That is only if I hadn’t been getting stringing on previous prints.