I did try it and several medium-sized rings went through okay but apparently the bottom side has to be pretty flat first. I had a ring explode inside the planer. I assume the first pinch roller cracked a glue joint, allowing an end to get into the blade, then it got exciting. I had to take the whole planer apart to clean busted pieces of segments out of the chip path.Ken:
I have never ran a segmented ring through a planer.