I have the Sizzix Texture Boutique which is a small embossing machine similar to the Cuttlebug (except that it does not do die cuts) I did a test on a small piece of fondant sandwiched between plastic wrap to keep everything clean. It made a nice impression and I would consider using it on fondant accents. The only problem is that with both machines you are limited to the size of the fondant you can roll through. It might not be worth the cost if you are using it strictly for cakes.
I use the embossing folders from those machines but put it through my manual pasta machine. You can adjust it to the thickness of your fondant.
Same here. I have used the Cuttlebug embossing plates. On my Harley cake, I used the diamond plate embossing folder. It worked pretty well.
Here's a pic of the side of the cake: http://cakecentral.com/gallery/1650975/1650976
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