also be sure to clean the cutter off after 1 or two cuts. I find that tiny bits of fondant stick to the cutter making the following cuts less smooth.
ETA: also, before lifting the cutter, giving it a little jiggle back and forth on your cutting surface will help smooth out those rough edges.
I have found the plastic cutter will not leave a nice clean edge. I use a pizza cutter for large items and I use a nice sharp exacto knife for smaller more intricate pieces. they leave a nice sharp, clean edge. If you do have an edge you want to smooth a little, dip your finger in a little powder sugar and rub the edge with your finger tip.
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