NetSpecter Rack Brackets and LCD Back Cover for Sophos SX/SG 125 Rev.3

Custom 3D printable rack brackets and LCD back cover for converting a Sophos SX/SG 125 Rev.3 appliance into a NetSpecter network visibility appliance.

The design adds rack-mount ears and a round LCD status display mount, as shown on the NetSpecter appliance build. The LCD mount is intended for a small round display module such as a BigTreeTech KNOMI V2 or similar 1.28 inch 240x240 GC9A01 round TFT display.

These parts were designed for Sophos SX/SG 125 Rev.3 hardware. They may also fit Sophos SX/SG 135 Rev.3 appliances, but that fitment has not yet been confirmed. Please check measurements before printing.

NetSpecter is a Debian-based network visibility, DNS analytics, monitoring, IDS, and licensing appliance project.

Project repo:

https://github.com/irish-frog/netspecter-v2

Included Files

• Left hand side.stl
• Right hand side.stl
• lcd back cover.stl

Hardware Needed

• M3 screws, approximately 25 mm long
• BigTreeTech KNOMI V2 or similar 1.28 inch 240x240 GC9A01 round TFT display
• Sophos SX/SG 125 Rev.3 appliance

Check screw length carefully before final installation. Do not use screws that can touch the appliance PCB, wiring, or internal metalwork.

Print Settings

Material: PETG recommended

Layer height: 0.20 mm

Nozzle: 0.4 mm

Walls/perimeters: 4

Top layers: 5

Bottom layers: 5

Infill: 40%

Infill pattern: Gyroid, grid, or cubic

Supports: Use where needed, depending on orientation

Build plate adhesion: Brim recommended for long bracket parts

PLA can be used for test fitting, but PETG is preferred for final parts because it is tougher and handles appliance/rack heat better.

Post-Printing Notes

Test fit all parts before final mounting.

Check screw length carefully so screws do not contact internal components.

Do not over-tighten screws into printed parts.

Confirm the LCD cable has clearance and is routed away from heat or sharp edges.

Make sure the brackets do not block appliance ventilation.

For best strength, orient the rack ears so the screw holes and mounting tabs are not weak across layer lines.

Fitment Notes

Designed for:

• Sophos SX 125 Rev.3
• Sophos SG 125 Rev.3

Possible but unconfirmed:

• Sophos SX 135 Rev.3
• Sophos SG 135 Rev.3

Disclaimer

This is a community hardware modification. Use at your own risk.

This project is not affiliated with, endorsed by, sponsored by, or partnered with Sophos or BigTreeTech. Brand names are used only to identify compatible or reused hardware.

Check clearances, screw lengths, thermals, and electrical safety before use. Do not block ventilation.