Shelly box for 2 flex wires and wago 221 connectors (1Plus, 1L, 2PM, 2.5, Dimmer2)

Part of my series of enclosures designed for Shelly smart devices and Wago 221 connectors.

• Shelly box for T&E 3x slots and wago 221 connectors 
• Shelly box for inline flex wire and Wago 221 connectors
• Shelly box for 2x flex wires and wago 221 connectors (this one)
• Shelly box for 3x flex wires and wago 221 connectors
• Shelly quad box for 2x devices/5x relays/5x flex wires and wago 221 connectors

Shelly box for 3x flex wires and wago 221 connectors

This box was designed for wiring appliances with wago 221 connectors. The box supports Shelly Plus1, 1L, 2.5, 2PM, Dimmer devices.

Electrical safety

• Mains electricity carries danger of death. Please don't attempt to use one of these with real circuits unless you are competent and aware of health and safety procedures.
• Use PETG or other fire resistant materials other than PLA.

Purpose and features

The enclosure is designed to connect 3 flex wires to 1 shelly device using wago 221 connectors. This could be used to switch two appliances with a Shelly 2pm or 1 appliance with an external switch.

Shelly device support: Shelly Plus1, Shelly 1L, Shelly 2.5, Shelly 2PM, Shelly Dimmer2

Wire strain relief: Each twin&earth entry port has slots for fitting a cable tie as strain relief for the wires.

Attachment holes: The box has counter-sunk holes to attach it to a surface.

Cooling slots: There are cooling slots all around and above/below the shelly device.

Lid fitting: The lid attaches to the box using 4x M3 screws (5-10mm max) which thread into M3 heat inserts to be installed on the box.

Printing notes

• The lid requires supports on the bolt hole counter-bores, otherwise it will not print cleanly (in my case it didn't)

Version control

Version 2.1 - 11/03/2024

• Updated (reduced) cable tie shelf width, validated lid locator and wago pad locations
• M3 heat thread inserts instead of square nut slots or holes for tapping
• Attachment bolt holes on the inside of the box rather than outside brackets
• Cable tie pads inside the box as opposed to accessible from the outside (enables refitting ties without dismounting the box)
• Shelly slot adjusted for compatibility with multiple models