I made this quickly by combining modified versions of two STLs so that I could use my endoscope. It is not pretty but gets the job done, and pretty amazingly so far. No other files existed when I looked. I used the pen holder from a user on the Creality Cloud site and an Ender 3 S1 endoscope mount found on thingiverse. My camera is somehwere between 5mm to 6mm and fits with a little shimming from tape. The pen holder was used because it used the factory mounting points and factory shroud. I went ahead and added my gcode from where I printed it on my E3V3SE.

Sources:

Pen mount: https://www.crealitycloud.com/model-detail/64ff4c4ccb4802a2e7f3ee66

Endoscope mount: https://www.thingiverse.com/thing:5230476