I recently tried running a USB 3 cable through my iOptron CEM40's internal cable guides. I only had one night with it since, but I noticed slightly worse guiding and some slight difficulty balancing it in DEC. This is due to the fact that the cable has to twist as the mount articulates, and this adds some resistance. If I spin DEC without the scope attached, I actually see it reverse and spin back at me.
I have not yet found any super-thin, flexible USB 3 cables yet. I'll test this configuration a bit more before deciding to keep it or not.
Edited by MountainAir, 17 January 2021 - 12:02 AM.