This is a case for a MP1584 buck / step down converter with a switch which I use to turn my Ender 3 v2 LED lights on / off.

The model contains a block to fit into the V-Rail on the Ender

Converter:

https://www.amazon.co.uk/dp/B089GV88DK/ref=cm_sw_em_r_mt_dp_8DM4YF7PNYZH622PKGPM

Switch

https://www.amazon.co.uk/dp/B07Q5WWQR1/ref=cm_sw_em_r_mt_dp_MMDS4ZFKCZBFT2CQMEZH

Creality

Ender 3 Pro

No

No

0.2

100

With super glue