Ah - the power (literally) of an Epilog laser. I dialed down the power to 15% and set speed to 100%; didn't want to wind up cutting my Fire in interesting ways! Took about 30 seconds to raster my name into the rubberized back of the Fire. Depth is about half a millimeter (or so). Nice compliment to the Kindle logo just above it. You see the detail of the rastering in the picture below. Click on it for a enlarged version.