Can you share why? It’s not obvious to me. I did the same thing years ago and got a dimple-free bend. Based on your photos I have a hunch that the dies were too short and you were trying to get too much bend angle out of one single squash, rather than creeping up on it with successive dies (yeah obnoxious process but such is life with a 3D printer and without a tube bender), but I’m not sure.
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