Check your max thickness on the 11880 it may be a 1.5 mil max like my smaller Epsons.
Have had no issues with the Inkaid but have only printed several dozen. I got sheets of.028 aluminum cut into photo sizes and have 2,3 and 4mm Dibond I will be laminating prints to. The.028is just too thin without a backer. I also adhesive a standout wood frame on the dibond backer so the extra thickness is needed.
If you can print on the thicker material you may not need a backer.
dan - i am getting closer to running some aluminum thru my epson 4900...
if you can please... how do you 'laminate' the printed aluminum to the 4mm diabond?