I have the Ender 3 V3 Plus and I did not want the light to be mounted on the top... way to far to be able to see what is happening on the bed... I had a small regular strip light bar, so I found a small spool adapter and added a slightly longer inner tube to get some grip (30mm total), then I did a separate sleeve to slide in and pass my light bar into the side mount spool I have printed for my printer (the light back insert can still go inside but I am relocating my spool on the top instead but will keep the mount on the side like in the picture here below.

The insert is also 30mm and I have the outside diameter on the first one at 19.99mm and it fit just a tad loose inside the adapter so I can turn it and direct my light where I want it... the light bar fit nicely snug without being too tight.

- the first version wall on the side of the light was too thin so it got printed in four small parts... I used PETG to sustain the heat from a light bar (PLA not good with heat) so I printed it with a brim... I kept a small part of that brim to hold the parts together and also as a stopper so the insert does not have a tendency to come out the tube when I push the light bar through...

- I went back into the CAD program and increased the outer diameter of the insert ("NEW" version), which maybe, is big enough for some walls to be created but I have not tried it but did add it in case someone wanted it... I would still print it with a brim and keep a small amount of it just in case...

I could have "molded" the insert with the spool adapter, but that would have been more complicated the find the "right" angle for my light to shine exactly where I wanted it... the insert also fit in the standard spool holder that came with my printer.

(p.s.: since the first insert was not fully done but working for me, I had deleted my previous file but someone asked about it so I put it back up with the "NEW" insert so someone can try it and see if working "better" - I just don't need to re-print it... : )

Spool Light Bar Adapter for Side Mount/Front of printer

0.2mm layer, 2 walls, 15% infill