Bike down tube cable mount

This set of down tube cable mounts includes a cover for either side (if you don't want to have a cable on either side) as well as cable mounts for both sides drive side (for a rear derailleur cable) and non drive side (for a front derailleur cable).

I have only tested it on my Surly cross check, I don't know if it will fir on any other bike. You can post it in the comments if it works for you and if not I can send you the original files as a .step so that you can modify the design to fit your own bike.