Cortana's Holographic Chip from Halo 5. I've modeled everything I can see from all the pictures and videos, I believe I've captured most of the details. Its about 110mm Long, I couldnt figure out the size based on Chiefs hands so you'll need to adjust the scale before you slice if you dont want a big model printing.
*UPDATE* 11-10-19. I've rounded things out and updated a few circles to make things easier to print.