Finally something finished to show you!
I used shiny poly fabrics which were fine to work with but wanted to try zig zag free motion and boy my janome did not like that! The thread kept shredding. I tried different needles, different threads, tension - you name it. Finally using a 90/14 embroidery needle seemed to work the best. One of the things I tried was putting the feed dogs down (which I don’t normally do for free motion and never had any issues) but I thought I would try it and the janome 6600 that I have wouldn’t let me put the feed dogs down while doing the zig zag. It kept telling me I had the darning foot on and how dare you zig zag with your darning foot on!