In this post i will describe how to make a 3d printed rack mountable blade for ESP32 modules, depicted on Figure 1.
The rack is 19 inches wide and the blade is with 2U height. For the blade i use this awesome Raspberry Pi 4 2U rack-mount bracket project available at thingiverse, made by russross. The original tray part is modified to have a fillment in the center and screw holes for mounting the ESP32 hardware device. The modified files are available here. The tray can be seen at Figure 2 and 3. It has also screw holes for mounting a RaspberryPi 4 hardware device.
An ESP32-POE-ISO-EA-IND hardware is used, bought from Olimex.