Flat ribbon cable holder/guide
thingiverse
This thing is designed for 15mm wide ribbon cable, like the display cables for the Anet A8 LCD. Use 8mm wood screws to fix the guide to your case and move the cable behind it. It should be springy enough, that you don't have to unmount it to remove the cable or put it in place. Update: I added a stl with the standing guide, no need for rotation any more.
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