Amazon Echo wall clock bezel

The Amazon Echo Wall Clock has no front "glass" yet does have a warning about dire consequences of touching the hands. It's also open (literally) to collecting dust, debris, and who-knows-what in our kitchen. My solution was to add an inexpensive (£5 from a well known auction site) perspex "glass" with a 3D printed bezel.

The front diameter is 250mm - too big for my Ender 3 Pro to print in one piece, so I separated it into 3 sections. Each has an overlapping extension to connect to the next, so each print is actually slightly longer than a 120-degree arc.

Each arc is constructed as a main length of 116 deg, extended by a 4-degree section grooved on the inside, to accept a 3-degree tongue extension from the inner surface of the opposite end. These have built-in support for the tongue, easily trimmed away after printing. A tiny amount of material may need to be removed from the overhanging part
of the groove, if there's slump in the bridging. The angle between the front and