theres enough room eveb if it had flat panels.
I had sent an email to Antec support ... they said ...
Trouble Ticket ID: 253299
Description: CPU cooler clearance for One case
Comment By: James Sean
Comment: Hello Jim, It won't fit, the One case is 208mm wide, it's too close for comfort and you'll be better off with a case that's at least around 230mm wide like the Antec Eleven Hundred for your 158mm Hyper 212.
So I have a 158.5 mm Hyper 212 Plus and I want (or maybe wanted) to buy a Antec One case ... and it appears that would be a mistake according to Antec.
What puzzles me is why they would build a case that would not allow one of the higher selling coolers to work ... if the case were just 5 mm wider?!