So I finished my daughters 5th birthday cake this weekend the top two tiers were RC so I finished those last weekend and the bottom tier was cake. It was my first attempt at the whimsical tiered cake and it did not go so well. I used a really firm cake mix, I followed the instructions in the tutorial and about 6 hours after assembling the bottom tier crumbled 
and was a complete loss 
, I had to cut what was left put it on plates and assemble the remaining tiers into a cake for her to blow out the candles on, it worked out but I was so dissapointed that is fell , any ideas on the cause or suggestions for the next one.
I am not sure why that happened but the pic of the cake is lovely...
I am sure someone who does the whimsey cakes will pitch in to help with advice.
Sorry to hear about the crumble... 
Did you use dowels in the cake before you set the RC on top?
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