My first attempt at designing my own part. This is a mount designed to attach to the top bar of a Bambulab A1. It was made specifically to hold a Feit Electric 10in light bar (https://www.homedepot.com/p/Feit-Electric-10-in-Fits-12-in-Cabinet-Plug-in-White-Dimmable-Linkable-Integrated-LED-Bright-White-Under-Cabinet-Light-3-Pack-BPLVUCL10-3-830/318112878) but it could be adapted for other uses. Contains a screw hole sized for an M3 screw as well as a slot for a zip tie to properly secure it snug.
Note: Be sure to space them in far enough to clear the brackets for the gantry.
Updated model modified to accommodate top mounted spool can be found here:
https://makerworld.com/en/models/128873#profileId-139592