C920 Webcam mount for Neptune 4 Printer

I mounted the mount upside down compared to the original design, so wanted the cam mounted further out from the bed, and wanted the mounting holes for the gantry to be part of the print rather than requiring drilling.

This isn't really a remix  (I re-started the model from scratch} but it is conceptually the same thing as the original with a few mods.

Note: there's a better remix now at https://www.printables.com/model/1250262-neptune-4-webcam-mount-offset-for-logitech-c920