This is a case for SeqG8 Core Mini with internal antenna.
SeqG8 Core Mini is a basic firewall from TouchWARE. It is provided only with 3D printed cases. It is mostly used as a small router, firewall or Wi-Fi access point.
Cut into two halves at Z=10mm. Print upper part upside down.
Use 4x Socket Cap Screw with Flat Countersunk Head M3x18mm to mount parts together.
It is possible to glue FIX-RF8-2.4A silicone legs (d=8mm, h=2.4mm) over screws.