These Sonoff switches are handy for automating dozens of things around the home, but occasionally they're too bulky to fit discreetly, and they're not exactly lookers if they have to be somewhere visible.

I've designed this to minimise the footprint to the absolute smallest size. The circular grill pattern keeps the unit cool and reduces weight and filament, allowing it to be printed in under 40 minutes on a modern printer. The holes also align with the function switch and the status light to minimise the depth of the unit while keeping it functional.

There are chamfered edges around the function switch and status LED to guide them through the holes when clipping the lid on, ensuring that nothing gets damaged.

The case is printed in PLA without supports or rafts. The PCB is simply placed in the base plate, and the top clips securely into place to create a compact solution.

Length is reduced from 88mm to 69mm
Width is reduced from 39mm to 37mm
Height reduced from 24mm to 21.5mm

3D Print Settings

• Filament: any
• Support: none
• Bed adhesion: only if you're printing on a non-stick frying pan
• Print time: 40 minutes on an Ender 3V3 KE, two days and five maintenance breaks if you're on an Ender 3 Neo.