I am making my stepson's graduation cake and could really use some ideas on what the best structre would be best for stacking so I have to tilting or sagging. It's going to be on a wood base....the bottom tier is a Xbox 360, the next two tiers are school books, and the top is a graduation cap and an Itouch. Any suggestions would be greatly appriciated!!
It wouldn't be any different than a wedding cake. Just dowel each tier and then run a long dowel through the whole thing.
I agree. Dowels/straws, cardboard circles and the center dowel. 
what about the individual layers within each tier. how can the bulge be avoided?
what about the individual layers within each tier. how can the bulge be avoided?
I fill my cake and allow it to settle for a few hours before crumbcoating and icing/covering with fondant. My cakes never have a buldge using this method. If you don't have a "few hours" to allow your cake to settle you can speed up the process by adding some weight on top of your filled cake
thanks so much for taking the time to reply, such a huge help 
so you stick the cake in the fridge after you put the filling in the cake for a couple hours then crumb coat it and then no bulge??
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