This AppleTV mount was designed to fit on the back of my 24" TV with an Inland 141 TV mount on a 100mm VESA mount using the M4 x 12mm screws provided with the Inland kit. The 12mm screws just barely fit my TV so 14-16mm would be better. Likely a bit thicker than needed when printing with a MK3S but should still be strong if printed with a cheap printer.
The author marked this model as their own original creation.