Story
This project aims to give the option to attach a monitor bracket to the Raspberry Pi 400 without any modification to the Pi400.
I've found that the Kensington lock insert on the right side (viewed from the rear) will take a M3 screw inserted at an angle and give a good grip.
Step 1:
Slice and print the STL files.
Step 2:
Mount the display in the display casing using screws
Step 3:
Mount the rear bracket to the Pi400 using a long M3 screw to the Kensington lock hole
Step 4:
Join the hinges of the two printed parts using 25mm M3 screws and the wing nuts.
Adjust the screws with optional washers to maintain the hinge friction you prefer.
Feel free to remix or modify with attribution.