First off, there is no way I could have even attempted to try this w/o this site and everyones help. Thank You! I don't do this on a regular basis, the last cake of any size I made was 4 years ago. Last weekend though I had a cake to make for my husband's cousin, it was her gift from us. Anyway, I thought it went pretty smoothly except for the middle 12" tier, it started to sag on the left side. I had it dowelled really good so the rest of the top stayed level, but there became a bit of a gap between the 12" and the 10". Did I mention it was 90 degrees that day? Is this just what happens with heat or did I over fill it? Thanks for looking.
Wow, that is one big cake!
I think you did a great job, I wouldn't change a thing!
As far as the sag on the 12" tier, I don't really have any experience with that so can't help there. I'm sure someone else will have an idea about that.
Your cousin must have been thrilled!
You did a wonderful job! I just wish I could see what is on top of the cake. What did you have going on up there? Your cake looks great and I am sure everyone enjoyed it.
The cake is beautiful! We always notice the little things wrong with the cake that no one else even notices. Like others have said, you don't notice it until you really look for it.
its a gorgeous cake and looks like you put a lot of hardwork in to it. 
I would chalk it up to the heat like the others said. I made one the other day that sagged horribly and I only had to go about a mile down the road. I think yours looks superb! Great job.
my, my cabincake...your cake is beautiful!!!! It looks wonderful to me and I have NO idea about sagging. I would have loved to received this cake as a gift!!!
You did an excellent job!
My only problem with tiers has been people knocking them over when they shouldn't be messing with the cake!!!!!!!!! 
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