I have too a brother innovis and use 2 different bobin cases. One if I use the original thread, the other if I use a different brand. And I do think it is necessary. Some time back I was very unhappy with the result of some stiching, due to the mal use of the wronge case. It is also explained in the manual.

I am afraid that I cannot really help. I do know that people do use embroidery thread in the bobbins when embroidering Free Standing Lace, so it looks the same from either side. I have a Bernina machine and I only use pre wound bobbins. I am sure that someone will be able to answer your post.

My Bernina has different bobbin cases for embroidery and sewing thread. Your manual should help.

Never heard of this. Have to get my owner's manual out now and start reading again. I did break 2 needles yesterday, but I thought it was because of the bobbin. I through the bobbin away.

I also have an Innovis. I will have to read up on the bobbins. Thanks for the information.

Sorry, I am a Bernina girl and can not help. I have 2 older models and the embroidery bobbin has a pigtail and the sewing does not. Kay

My (Janome) machine has two bobbin cases, one of which is for non Janome bobbin thread. They need to be set up at a different tension as the Janome thread is a heavier weight than the other makes.

Your regular bobbin case should work fine with either regular sewing thread or bobbin weight thread. Prewounds are bobbin weight. The second bobbin case if for specialty/usually thicker threads where you would need to adjust the bobbin tension. When sewing, you do use the same thread in the bobbin, but for embroidery most digitizers recommend bobbin weight thread. Hugs. Nan W

For Brother and BabyLock, it is not the brand of bobbin thread that determines which case to use, it is the thread weight. I try the standard case (green screw) for everything. If I need more or less tension on the bobbin thread, I switch to the alternate case. You are not supposed to adjust the tension on your standard case but you can adjust the tension on your alternate case. Your 'new' dealer may have been trying to sell you more thread.

The bobbin case with the little green screw on the side is for "regular" thread (not the fine bobbin thread - this would include thread matching the top) and the bobbin case with the purple dot in the bottom is for the bobbin thread (like prewounds). I personally ALWAYS use the green screw version and I use either matching thread or bobbin thread in it with no issues (this is true of both of my brother machines - one with over 10 million stitches). Some dealers try to tell you ONLY Brother threads - this is not true - you can use whatever thread you want to use (I do recommend a quality thread) - even cottons. Using a thread other than a Brother tread does not void your warranty (as some dealers will try to tell you).

I have a babylock and always use the regular bobbin case, never have changed to the other once. And I don't use their bobbin thread either as it is so expensive and I've not had an issue in all the years I've had my Ellageo.

I have used the same thread in the bobbin as on top and not had any trouble. I have been embroidering for over 25 years