While browsing about on the CT website I noticed their polyester cone quilting thread, which is 70/2 wt. It is mostly for long arm machines, but I was wondering if it could be used in regular machines. It sure would save a lot of bobbin changing.

So...does anyone use a thinner thread in their bobbins? And what kind?

I always use a thinner thread in my bobbin for FMQ; usually Bottom Line from Superior. I do want to try the CT poly thread and will next time I place an order. I also use Bottom Line for intricate piecing and paper piecing, in the bobbin and top thread. If you're making a small block with a lot of seams the thread width can make a difference.

I'll be interested to see what others have to say.

I usually only use a lighter weight thread when I machine embroidery. Interested to see what others say/think.

i use thin prewounds in my bobbin

I use Bottom line from Superior, I use masterpiece for piecing

i've used 'bottom line' a few times- i like the thinner threads in the bobbin- sure saves winding bobbins so often-especially if you are working on a large project and don't want to have to stop to wind another bobbin.
it depends on the machine though- and i guess what thread you are using on the top- once in awhile i have to change thread a couple times to find the right combination- if i'm not matching threads.

I always use a thinner thread in my bobbin. The 301 doesn't hold much and I'm not a fan of bobbin changing. None of my machines care if the thread matches.

I use a 60wt Gutterman in the bobbin. Now that I know that using "poly" is a myth I want to try the Bottom line from Superior. I'm almost out of 60 ... so it will be time to buy some soon :)

Aurifil bobbin thread it is 60wt!

For piecing, prewound bobbins (Janome) and Superior for the top.