To fit the awesome Minimus fan shroud from Rogue Designs https://cults3d.com/en/3d-model/tool/minimus-hotend-cooler-system
Clips into the secret 3rd duct clip under the main body to fit an 8mm diameter body endoscope that is aimed directly at the nozzle to provide close up video / monitoring of the filament being laid down. https://youtu.be/zKHLdHDIN20
The Endoscope is a tight fit into the holder but provision is made for M3 heat set nut so you can use an M3 bolt to clamp it down.
The author marked this model as their own original creation.