Enclosures for the 4.2" e-ink display from Waveshare. Powered by one 9 V solar panel.
A horizontal and a vertical oriented version is possible. The lid fits both.

A NodeMCU ESP8266 or ESP32 is powered by a 18650 3.7 V Li-ion battery which is charged by the solar panel on the box using a TP4056 charge protection board (link below).

This thing is kind of "work in progress" since I'm not sure if the panel will be able to power the NodeMCU/Display in the long run. But my similar box for the 2.9 inch display has been running for almost a year uninterrupted..

The ESP8266 is in deep-sleep mode to conserve energy and wakes up with regular intervals to update the info on the display.

Parts list:

• 4"2 inch display (Three-color)
• NodeMCU
• Solar panel 9V
• TP4056 Charge protection board
• A 18650 Li-Ion battery.
• 1 diode.

Note: I measured quite a difference in power consumption in deep-sleep between the various NodeMCU boards I've bought from various sellers. Up to 200 (!) times more power used in deep-sleep for the least efficient one compared to the most efficient.

Code for displaying weather forecast can be found at Github. Thanks to G6EJD for making it public.

Prusa

i3 MK3

No

No

Printed both the box and lid without support.

Update 1: Replaced the original 6 V solar panel with a 9 V version which is much better at keeping the battery charged. Had to change panel cutout dimensions a tiny bit to make it fit.

Update 2: Changed the solar panel cutout design a little bit as the panel (on both types) kept sliding out at the bottom. Now there is a resting point in the bottom which should prevent this.