Can I stack without needing support? I want to do a tree stump with 3 layers of cake. Will this collapse under the weight of the fondant or will it be ok? I will start with 10" layers. THANKS!
It depends on the width but I think 3 10" layers would be fine. It sounds like any other layer call you'd get by the slice in a coffee shop and those don't need supports.
You should be fine. I've stacked more layers than that with no support.
I believe the general rule is you need support every 4inches you build up.