We stopped using batting...
Unless it is cross section quilted every inch, to half an inch. The batting will separate from the edges, and ball up in a corner. Then you have the cut all the stitching and remove it. You can use quilted batting, but it is pretty pricey.
Most people here are using 2 layers of fleece sewn together. We have chins that stomp, and therefore we use 3 layers. Anything more than that, and you will need a commercial surging machine to keep it together. Or you could cut everything, and take it to a upholstery shop, patio furniture repair, Sail maker, etc...
Ro is going to play with this Husqvarna embroidery machine and see if we can make a 3D headstone for Bowie our vampire chin. Anyone have a Dongle???
Well I have used a towel in between on two of my layers but I think it's hard for the sewing machine but I might try it again because that was the first time I have used a sewing machine since 8th grade. Any other ideas?
No way... You will probably break the needle before you break the machine.
As long as it does not bog down severely, and you use 110/18G needles or larger, you should be fine. Ro uses an old 1970's sewing machine most of the time, I have one of those cheapo Brother machines from Walmart.