Janome Low Tension Bobbin Case MC11000, 6600, and 6500

Q: Is this also the bobbin case needed for the MC 6300 for free motion quilting?

According to Janome, this is the model number of what will fit the MC 6300. http://content.janome.com/index.cfm/machines/Sewing-Quilting/MC6300. From what I can tell, if it fits the 6500 and 6600 it fits the 6300 as well.

Q: Is this the one that is for machines with a thread cutter? Will it work with a singer studio s19? Thank you

I use this in my Janome 6600P and it does have a thread cutter. I don’t know if it will work with a Singer.

Q: Does this work for Skyline S7?

check sewingpartsonline.com and see what they say

Q: I've always free motioned (20+ quilts) with my regular bobbin case. It needs replacing. What is the difference between this and standard one?

I would use the regular bobbin case unless you had a special circumstance. I have had great success with the regular case doing free motion quilting. I know of a free motion instructor who has a Janome and says that the regular bobbin case is just fine. I've been occasionally buying the odd accessory or presser foot for my new sewing machine while they are available. I only bought a low tension case as a standby in case I need it for a special circumstance in the future, though it may be totally unnecessary.