This is a cap for the 7mm inspection camera I used for monitoring the toolhead.

The mount and photos of the camera in place:
https://www.printables.com/model/344788-biqu-h2-7mm-inspection-camera-mount

True diameter of the camera is 7.49mm.

The one I'm using here:
https://www.aliexpress.us/item/3256804147019750.html?spm=a2g0o.order_list.order_list_main.15.76981802oVDiqh&gatewayAdapt=glo2usa&_randl_shipto=US

Left a 1mm deep, 2mm wide recess in the end of the cap for a magnet to store it on the steel frame of the Ai3M when not in use.

I printed it in a neon green PLA.  When the lights are left on it glows bright green (diffusing the light), letting me know I need to turn them off.

Print it upside down, like in the photo.  It prints fine this way without any rafts or brims.

Included is the FreeCAD model.