Designed this for my Dad who wanted to mount the Apple TV onto the rear of his TV.
Whilst designed for the 1st/2nd gen 4k, it should fit the 3rd gen fine as well as its only smaller, it just won't be as snug.
You'll need some M4 screws to secure the mount to the TV, I had some M4x8mm which worked fine, but be careful especially if you have a thin TV/panel.
I did print it as shown in the 3MF file to avoid printing supports in the enclosure.
Printed fine in PETG with organic/tree supports for the lower part of the model, but would highly recommend supports for the top 2 arms as well. I managed to get away with it although it wasn't neat.
Accidentally made a 200x200 mount which you can find here
STEP files are included if you wish to modify it
The author marked this model as their own original creation.