I just purchased a Mutoh XPJ661 UF, we went to a distributors open house specifically because both Mimaki & Mutoh had reps there.
A couple of the Mimaki reps said it "can" print Braille, once I talked to one of the higher up Mimaki reps that I knew from the past, he said unfortunately I should purchase the Mutoh, they have Mimaki beat right now.
Apparently Mimaki Is having a hard time building up high enough with the proper rounded finish to be certified.
I've opened 3 Mimaki printers with SS21 inks & I've loved all of them & when I purchase another Roll to Roll printer I will definately get another Mimaki, but I will say I've been very impressed with the XPJ 661. & their included Vertelith RIP software seems to do very well.