I've done a queen on a brother with a ridiculously small hole. I don't think I could have fit anything larger. I am now quilting a king on a Singer 15-91 - much more room. The biggest thing for me is to do little bits at a time. Since you are moving all the weight of the fabric through the machine, and pushing against the bulk in the opening, my arms get tired, and if I over do - my shoulders hurt to bad to do more the next day. And I use basting spray instead of pins -- it seems to hold everything together more smoothly while you are rolling and unrolling.