Creality Ender-3 Led strip holder
thingiverse
This is just another mounts for COB LED strip 70x15 Led strip example: https://www.banggood.com/6W-76led-COB-LED-Chip-520mA-WhiteWarm-White-For-DIY-DC-12V-p-960210.html To mount those you should attach to the rail and rotate. But rotation is available only in one direction - check what side has skew that allows to rotate the mount. Update 2018.11.02 - two versions with different angles. I found out that it is better to project light to the bed than to the nozzle. Saves eyes :)
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