Prusa B4 LED Spool holder
thingiverse
I needed a LED light holder that mounted on the back and wouldn't interfere with tall prints. I tried a few even designed a few and they wasn't quit what i wanted, I remixed this from the B4 spoolholder on the Prusa website (link below) with this is keeps the light out of the way and works for what i wanted. I am just using some cheap LEDs that i took on the plastic part on the ends and slid it thorugh the holder. I used hotglue to hold it nice but its not necessary https://www.prusa3d.com/prusa-i3-printable-parts/
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