DIY 3D LED Flashlight with 9 white LEDs in 3D printed case

Have you ever wished you had a compact but powerful flashlight you could build yourself? 🔦✨ This DIY 3D LED Flashlight makes that possible. Using nine ultra-bright 5mm white LEDs, it combines simple electronics with 3D printing to create a reliable light source that’s both functional and customizable. Whether you’re new to electronics or already into DIY projects, this flashlight is a great way to learn while making something useful.

What You’ll Learn

By building this DIY flashlight, you’ll:

Understand the basics of parallel LED wiring.
See why current-limiting is important in circuits.
Learn how to combine electronics with 3D printing.
Create a practical tool while gaining hands-on experience.

This project is designed for beginners, but even advanced makers will find it fun to customize and upgrade.

Why Build a DIY 3D LED Flashlight?

Unlike store-bought flashlights, this DIY 3D LED Flashlight can be designed to match your style. With 3D printing, you can adjust the casing size, shape, or even color—making it truly one of a kind. At the same time, the multiple LEDs provide enough brightness for indoor and outdoor use, giving you a practical tool that’s proudly handmade.

More than just a source of light, this DIY 3D LED Flashlight represents creativity and innovation. It proves that with just a few components and imagination, you can craft a tool that’s affordable, sustainable, and easy to maintain. Whether for emergencies, camping, or simply the joy of making, this project shines in more ways than one.

This project also connects with its colorful sibling, the 3D RGB Flashlight, which works on the same concept but allows you to switch between red, green, or blue LEDs. Together, they show how one simple idea can branch into different versions—whether you prefer a bright white torch or a playful RGB twist, both capture the spirit of making technology your own.

What You’ll Need:

Circuit Diagram:

How it Works?

The DIY 3D LED Flashlight runs on a simple circuit powered by two coin cell batteries in series, giving a total of about 6V. When the power switch is pressed, current flows from the batteries through the circuit and into the LEDs.

Because the LEDs are connected in parallel, each one receives the same voltage. This ensures that all nine white LEDs light up evenly and provide bright illumination. The use of parallel wiring also means that if one LED fails, the others will continue to work.

In this design, the coin cell batteries naturally limit the current, so the flashlight works even without resistors. However, if you upgrade the power source to stronger batteries (like AA, AAA, or rechargeable Li-ion), you should add a resistor in series with the LEDs to protect them from too much current.

This simple system combines basic electronic components with a 3D-printed casing, resulting in a reliable flashlight that is both functional and customizable.

Applications and Extensions

Once you’ve mastered the basics, try upgrading this project by:

Adding RGB LEDs for a multi-color flashlight.
Using rechargeable batteries for longer life.
Integrating a dimmer or brightness control.
Customizing the 3D-printed case for different sizes and styles.

These improvements show how a beginner-friendly build can grow into more advanced electronics projects, giving you both a practical tool and a deeper understanding of circuits.