This project adds an external LED light strip to the Bambu Lab P1S printer, synchronized with the internal chamber light using MQTT over the local network.

The goal is to improve visibility inside the printer while keeping the behavior fully aligned with the printer’s native light control, without modifying firmware or adding manual switches.

The built-in light of the Bambu P1S is functional but relatively weak, especially for long prints, monitoring, or video recording.

You have two options to add a LED strip to the printer:

• Add a LED strip that consumes less than 0.3 amps and you can replace the connection to the onboard LED light and use the printer button to turn the light on and off
• Add a LED strip that consumes more than 0.3 amps, use an external power and not control the leds using the printer.

Instead of using an always-on LED strip or a separate switch, and not being able to use the printer to turn the lights on and off, this project listens to the printer’s own MQTT messages and mirrors the state of the internal chamber light.

When the chamber light turns on, the external LED strip turns on. When it turns off, the external light turns off as well, using smooth fade-in and fade-out transitions.

Everything runs locally.