SOMETIMES A LITTLE ADHESIVE IS BEST
It may take a little longer for other handle bar manufactures apart from Pro to make Di2 specific parts. If you aren’t so lucky to have the Pro Tharsis bars, hiding Di2 cables can be a little unsightly. But Shimano do make some great adhesive cable covers which have a perfect groove for a Di2 cable to sit in. They come in a small box of a few different lengths. I usually cut one of the larger sections down to cover the cable from the shifter to the system display. It keeps it tucked up into the bars and out of the way.