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.

Have you found that in anything but black or white? I don't use those colors.

I always use the same weight and fibre on the top and in the bobbin for quilting piecing. I don't want something breaking from a stronger thread sawing through a weaker one or puckering from uneven shrinkage. But for quilting, anything goes.

Do you mean the it is now acceptable to sew cotton with poly thread? Piecing or quilting?

When I first started quilting, many years ago, I sewed everything with the old C&C cotton covered poly. I made small "quilts" that I used to cover the furniture seats. My husband sat on his on his recliner for years...probably 10 or more. ONE quilt square started to deteriorate and I just covered that with another square and ZZd around it. I'd say that wore very well under heavy use.

I use 60wt cotton in my bobbins for piecing, don't have to refill the bobbins so often that way. Haven't had any problems with doing this. A friend of mine has been doing this for years.

When I bought my Janome 6600, the dealer told me to use Bottom Line in the bobbin. It is 60 wt. poly. It does a terrific job. I usually buy it from Superior threads. I use it for piecing and quilting with no problem.

I use pre-wound 60# for my FW for piecing. I get them on Ebay 144 for $10.00. They are super. Black and white and I have found them From Marathon in the primary colors. 12 for about $5.00