If 100% is working correctly and filling 100%, but any lower infill looks sparse or stringy, then you may have your print speed set too high.
If its like S3D, then 100% infill speed is printed at Top/Bottom speed, whereas lower infill percentages are printed at full speed. And for TPU, that may be too fast.
So try lowering the infill speed to your top/bottom speed.
Just a WAG.
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DidierKlein 729
What is the problem with TPU? i don't understand your question sorry
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