Thread nests
Also: Birdnesting, Thread bird's nest
beginnerStub
A tangled clump of thread on the fabric underside, jamming the feed, comes from unbalanced tension or starting a seam without holding the thread tails. Rethread fully, check tension, and hold tails taut when starting.
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See also
Loopy stitches
Visible loops sitting proud of the seam point to unbalanced tension, most often a bobbin thread with too little resistance. Rethread top and bobbin, adjust tension gradually, and test on scrap first.
Loose stitches
Stitches that sit slack and don't lock into the fabric come from top tension set too low. Increase the top tension gradually and test until stitches lock in the middle of the fabric.
Puckered seams
A seam that gathers or ripples along its length is caused by tension set too tight, a stitch length wrong for the fabric, or sewing fine fabric without stabilizing. Loosen tension and stabilize lightweight fabrics.
Thread breaking
Thread that snaps repeatedly while sewing is usually old or low-quality thread, a burred needle eye, or tension set too tight for the thread weight. Use fresh quality thread, replace the needle, and ease the tension.
Bobbin thread showing on top
Dots of bobbin-colored thread on the fabric's right side mean top tension is too tight relative to the bobbin, pulling bobbin thread up through the fabric. Loosen the top tension and test on a scrap.
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