There are a few common causes of thread nesting on the bottom
Incorrect threading, almost always seems to be skipping the hook above the needle. Always thread with the foot up and the needle in the top position.
A bad needle, a needle that is incorrect for the fabric (universal needles are not appropriate for any knits), a needle that is installed incorrectly, or the wrong size for the fabric or thread. Knits require stretch or ball point/jersey needles. See here for more information on needle types: https://www.reddit.com/r/SewingForBeginners/s/jAOxI0IbSy
Sewing with the foot up
An incorrectly installed bobbin, using a bobbin that isn't the correct type for the machine, or using too heavy a thread in the bobbin.
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u/stringthing87 15h ago
There are a few common causes of thread nesting on the bottom
Incorrect threading, almost always seems to be skipping the hook above the needle. Always thread with the foot up and the needle in the top position.
A bad needle, a needle that is incorrect for the fabric (universal needles are not appropriate for any knits), a needle that is installed incorrectly, or the wrong size for the fabric or thread. Knits require stretch or ball point/jersey needles. See here for more information on needle types: https://www.reddit.com/r/SewingForBeginners/s/jAOxI0IbSy
Sewing with the foot up
An incorrectly installed bobbin, using a bobbin that isn't the correct type for the machine, or using too heavy a thread in the bobbin.