I wanted a case that I can attach to body of the printer, and sometimes deattach easily and something with a cam arm.

You can find the cam arm here: https://www.printables.com/model/3407-articulating-raspberry-pi-camera-mount-for-prusa-m/files

This model has been inspired by this design: https://www.printables.com/model/51568-octoprint-with-hyperpixel-display-and-camera-mount