I don't get that. if each layer is even it wouldn't matter how many layers there are, would it? or is it to do with where the 'shingles' overlap? You can make cobweb or nuno with 1 layer can't you?
Jill, the matter is that the wool shrinks more in the direction of fibres. That's why it's advisable to have even number of layers if you alternate direction with each layer. Or make allowances for different shrinkage in diff.directions.
I use the machine for larger items ( front loader on short cold cycle) it does shrink a bit more than hand rolling but with a bad shoulder rolling a lot is just not possible for me, so I take the risk and so far it has worked out ok except for the red vest which over-shrunk by a lot, but I now know that a single layer of fluffy prefelt will shrink a lot anyway... pity I didn't know earlier but we learn by our mistakes.
Sue B. Thanks for Sharing.
"It is the divine right of every individual to be creative" (Arthur Boyd).