This is a camera arm to mount on your KP3S stepper (probably work with other steppers). I made to be used with the Arducam USB model using this Arducam Case or you can give this mount a shot.

2 different go pro mount lengths for perhaps different camera angles/different bed heights.

You will need 2 M3 screws to mount the arm to the stepper bracket, 2 M3 screws & nut to attach the go pro mount to the arm, and 1 go pro screw/bolt (stole from another go pro mount I had).