AYouTube icing a square cake with sharp corners. Or google it. There's tons of videos. Also I find buying magic line square cake pans really help because the corners come out pretty sharp every time
Even with Magic Line pans square cake corners can tend to drag down a wee bit. I combat this with 1) making sure to use a good stiff buttercream as a dam for the filling and 2), I add an additional small squeeze of that stiff buttercream at each corner. The other thing I find helpful is to crumb coat it lightly and let it sit for awhile before attempting to add your final coat of icing. Most important of all, is your icing consistency. I find medium consistency best for me.
AHonestly, it doesn't matter if the cake is completely round, you can ice it to a sharp square if you do it right. They key is using a good bench scraper, and scraping it off flush to the shape of the board that the cake is sitting on. That's the key. Building it up, scraping it down. Chilling every once in awhile to keep the built up areas straight and solid, and adding more. Using acrylic boards helps too, in that case, you're just filling in the empty spaces and it comes out perfectly.
Google "icing cakes using acrylics" to see what that's about, or find Sift by Kara, she has lots of info about it. I'm not gonna get into it here, easy enough to find the info online.
https://www.youtube.com/watch?feature=player_embedded&v=WH2sfcXT79A
" how to ice a square buttercream cake super smooth with perfect corners " youtube
by Jennifer White
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