I couldn't find a fitting holder for my 7.8mm diameter endoscoop camera that fits on my mk3S+.
Found this model on thingyverse: https://www.thingiverse.com/thing:4055057/filesn and modifited it to fit an 8mm endoscope camera. I used this one that worked on octoprint: https://a.aliexpress.com/_mMHZT2c.
fit top mount with a tapered head! otherwise calibrations will fail.
The author hasn't provided the model origin yet.