I have a CREALITY Ender3 and I made this bracket for mod-ing an IKEA Jansjo flex lamp to the top of the frame. Really handy to put a spot of light right where you need it, especially for loading filament at the extruder or inspecting a print in progress, or printing a lithophane and just cant wait to see what it looks like while it's printing I know I'm giving up the top of the build envelope of the printer (Thanks in advance for not pointing that out, it is easily removable if I should need the top 40mm of the printer's build capability). Print 2 of these brackets to clamshell around the top rail and lamp's 'in-cord' switch. Use the screws from the lamp to hold it together

Finish off with a couple of cable clips like these: https://www.thingiverse.com/thing:2960375