Case described in: https://m11tch.github.io/blog/2026/02/25/zehnder-comfoair-integration.html

I've added version 3.0 of the openscad file which allows enabling/disabling the DAC module. 

Bill of Materials

• ESP32 Mini D1

• RS485 to TTL Module

• DFRobot GP8211S DAC Module

• 3D Printed Enclosure

• Standard RJ45 Network Cable (for the C3 connection)

Depending on the tolerances the modules fit loosely in the case, you can optionally use some hotglue to further lock them into place if desired.