Free motion quilting is a finicky function, much more than most other sewing. Since you are getting loops on the back of the fabric, try increasing the upper thread tension. Tension causes the top and bobbin threads to pull against each other. If the pull is not equal, the threads will be pulled to one side or the other.
If you continue to experience looping under the fabric, it could be that the top thread is not fully seated in the tension disk. Try this:
Remove the top thread completely from the machine.
Be sure to install a brand new sharp needle.
ALWAYS RAISE the presser foot and rethread from the beginning.
Retest your machine.
However, if you don't find a fix, $25 for the special bobbin holder is probably a reasonable cost if it takes care of the problem. The reviews seem to be good:
http://www.sewvacdirect.com/janome-bobbin-case-for-free-motion-quilting-fits-models-mc14000-mc6500p-mc6600p-mc11000-mc7700-mc12000-and-more/
https://thequiltshow.com/forum/domestic-sewing-machines/120-janome-mc6600p
"Yesterday I bought a new free motion quilting foot and a bobbinholder (for free motion) for my MC Janome 6600P. I have been quilting all day, and belive you me it is a greate investment!!! :lol: :lol: Its like sewing on butter :lol: :shock:
Free motion Quilting Foot: part no.: 200-442-004 (MC6600P and MC11000)
Bobbin Holder (for free quilting and hand-look quiltstitch): part no.: 200-445-007 (MC 6600P, MC11000 and MC6500)
Bet you would love to have those too if you are doing a lot of free motion! The quiltfoot you can adjust so it works perfectly on your quilt!
:lol: :D :wink: I am sooooo happy!!!!"
https://www.getasquiltingstudio.com/2012/01/free-motion-quilting-tips-ii.html LOOPS Tension or Speed Free Motion Quilting Tension Problems ///
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