Originally Posted by
sash
I use the bobbin case with the blue dot when fmq'ing; makes a big difference.
The 1600 isn't a top loading bobbin.
I have a 1600P QC and the HL needle is the exact one recommended for the machine. I doubt it is the needle alone, unless it is the fact that your fabric is someone really dense and the needle is trying to slide between the threads, and needs to just "pierce" the threads.
--my machine has been "trouble-free" so far (so grateful)...in fact, it's lovely AND fast.
But, try all that people have suggested including making the bobbin and top thread match (sometimes I don't have them matching) and a Superior titanium topstitch needle with a larger eye (I've done that when I broke me last HL needle and didn't have anymore..it worked just fine.)
Is there anything unique about the fabric you are using? Is it an especially tight weave?