This is a minimalistic 7.3 inch photo frame for the 7.3 inch Waveshare e-ink screen.

It can stand either in portrait or landscape mode with one detachable stand.

It is designed for this screen  along with a rpi zero: 

7.3inch E Ink Spectra 6 (E6) Full Color E-Paper Display, E-Ink Display, Low Power Consumption, 800×480 Pixels, SPI Communication, Optional For E-Paper Driver HAT | 7.3inch e-Paper HAT (E) 

It features a small connection box at the back large enough to accommodate the pi, the e-paper driver hut and a micro usb board like this one:

microB USB Breakout Board

It mainly consists of two parts, the front and the back plate, that can either be glued together or be joined using magnets that can be placed in the relevant slots. These slots are for 8pcs of 5x2x1 mm neodymium magnets that can carry about 240g  each. This should be more than enough.

Especially for the front plate you should leave it to cool down completely  after the print because it is very easy to warp due to its thin size.

Note:

It is sized to fit exactly the dimensions given by the manufacturer. Τhere were reports of screens not meeting these dimensions. Please check your screen before printing.