3-LED Pocket Flashlight (18650 & TP4056)

Looking for a highly practical, ultra-bright 3D print to use up an extra 18650 cell? This compact, rugged pocket flashlight is the perfect weekend project! It features a minimalist, box-style design that houses three powerful 10mm LEDs, a rechargeable battery setup, and a simple push-button switch.

Whether you need a reliable emergency light, a bedside torch, or a handy light for your workshop, this print is durable, easy to assemble, and fully rechargeable.

🛠️ Hardware & Components Needed

To fully assemble this model, you will need the following electronics:

• LEDs: 3x 10mm White LEDs (Provides a wide, bright beam)
• Battery: 1x 18650 Lithium-Ion Battery (For long-lasting capacity)
• Charging Module: 1x TP4056 USB-C Charging Board (Includes overcharge protection)
• Switch: 1x Push On/Off Switch (Latch style)
• Note: Depending on your specific LEDs, you may also want to include a small resistor (e.g., 1Ω to 10Ω) to protect the LEDs from the direct 3.7V–4.2V current of the 18650 battery.

🖨️ Print Settings & Recommendations

• Material: PLA works perfectly, but PETG or ASA is recommended if you plan to keep it in a hot car or use it ruggedly outdoors.
• Infill: 15% – 20% (Gyroid or Grid for structure).
• Walls/Perimeters: 3 walls for extra durability around the switch and LED friction-fit zones.
• Supports: No supports required if printed vertically on its solid back end!

🔧 Assembly Quick-Tips

1. LED Wiring: Wire the three 10mm LEDs in parallel so they all receive the same voltage from the battery.
2. Fitting: The LEDs and the push button are designed to be a snug friction-fit, but a drop of hot glue or superglue inside the housing will keep everything permanently locked in place.
3. Charging Access: Ensure you line up the TP4056 module correctly with the rear cutout so you can easily plug in your charging cable.