This is a simple mounting bracket to attach a Logitech C270 to the Ender 3 X-gantry. It holds the camera at a good angle towards the bed and printing head, with the tilt being adjustable. The camera and bracket itself are attached using a clamping mechanism (using two M3 screws).

I printed the bracket in PLA at 0.2mm layer height, on its back, and with no supports needed. For the clamping mechanism to work properly your printer should be somewhat well calibrated.