Print with 0.2 mm layer height, supports are needed only for the hinges.

It holds together with the snap fit prongs, but it can alternatively be glued together using a glue gun if needed (for me it wasn't needed, the snap fit holds really tight)

ESP32 board and battery can be attached using a tape or a sticker. I've used a 20mm kapton tape.

I used this display compatible with GxEPD2 library: https://vi.aliexpress.com/item/1005005443326604.html

Update V2.1:

The hole to hang the frame onto a wall is now keyhole shaped and the frame uses snap fit on all sides, not just on the top+bottom.

Update V2.2b:

The frame can now be used in landscape orientation too. Also the cutout for the ePaper display has been made 1 mm smaller smaller to better hide ePaper borders and the frame is slightly thicker near the flex cable.

Source files:

Created in Onshape. Parametric source file are here, feel free to customize it for your needs. There is also a configuration preset for a symmetric variant (but that one needs a larger print bed size).

You can also view the assembly and simulate the frame vs backplate movement.