Green Lantern Battery – Full-Size & Mini Versions

🔧 MillersCraft — Functional Prints for Makers, Crafters & Builders

Everything I design is built to actually get used — on the workbench, at the table, in the field. I focus on functional tools, organizers, props, and accessories that solve real problems and look good doing it.

I model in Fusion 360, print on Bambu Lab, and test everything before it is uploaded. All print profiles are dialed in — just slice and go.

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Green Lantern Power Battery – Downloadable 3D Model

• Available in two versions: full-size and fun-size
• Fun-size model works great with a simple LED + coin battery for a glowing mini lantern
• Full-size model designed for DIY electronics integration
  • Supports 18650 rechargeable battery
  • Space for a power switch
  • Designed to fit a NeoPixel x16 LED ring
  • Compatible with a TP4056 charging module
  • Includes ports for a 5V DC-DC power converter
• Powered by Adafruit Pro Trinket 5V microcontroller (electronics not included)
• Programmed NeoPixels flash in dynamic, randomized patterns for an authentic glowing effect
• Perfect for:
  • Cosplay props
  • Collectible display pieces
  • Custom DIY electronics projects
• Delivered as STL files for 3D printing at home

For the coding of the Pro Trinket, here is the script.
#include <Adafruit_NeoPixel.h>
#define PIN        8
#define NUM_LEDS   16
Adafruit_NeoPixel ring(NUM_LEDS, PIN, NEO_GRBW + NEO_KHZ800);
bool twinkling[NUM_LEDS];
int twinkleBrightness[NUM_LEDS];
int twinkleDir[NUM_LEDS];
unsigned long lastUpdate[NUM_LEDS];
int fadeSpeed[NUM_LEDS];
const int BASE_BRIGHTNESS = 80; 
const int PEAK_BRIGHTNESS = 255; 
void setup() {
 ring.begin();
 ring.setBrightness(255);
 randomSeed(analogRead(A0));
   for (int i = 0; i < NUM_LEDS; i++) {
   twinkling[i] = false;
   twinkleBrightness[i] = BASE_BRIGHTNESS;
   fadeSpeed[i] = random(10, 30);
   lastUpdate[i] = millis();
 }
 updateRing();
}
void loop() {
 unsigned long now = millis();
 if (random(0, 100) < 5) { 
   int led = random(NUM_LEDS);
   if (!twinkling[led]) {
     twinkling[led] = true;
     twinkleDir[led] = 1; // fade up
     fadeSpeed[led] = random(5, 15); 
   }
 }
 for (int i = 0; i < NUM_LEDS; i++) {
   if (twinkling[i] && (now - lastUpdate[i] >= fadeSpeed[i])) {
     lastUpdate[i] = now;
     twinkleBrightness[i] += twinkleDir[i] * 15; 
     if (twinkleBrightness[i] >= PEAK_BRIGHTNESS) {
       twinkleBrightness[i] = PEAK_BRIGHTNESS;
       twinkleDir[i] = -1;
     }
       else if (twinkleBrightness[i] <= BASE_BRIGHTNESS) {
       twinkleBrightness[i] = BASE_BRIGHTNESS;
       twinkling[i] = false;
     }
   }
 }

 updateRing();
}

void updateRing() {
  for (int i = 0; i < NUM_LEDS; i++) {
   ring.setPixelColor(i, 0, twinkleBrightness[i], 0, 0); 
 }
 ring.show();
}
 

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A like ❤️ and a make 📸 go a long way — they help other makers find the model and keep me designing. If something doesn't print right, drop a comment and I'll sort it out.

🖨️ Print Tips
All profiles are tested on Bambu Lab hardware. If you're on a different printer, standard settings apply — 2 walls, 15–20% infill unless the model notes say otherwise.

📦 More from MillersCraft
Organizers · Leatherworking Tools · LARP & Cosplay Props · Gridfinity · Lanterns · Coin Vaults
→ makerworld.com/en/@millerscraft

Thanks for printing. Make something great. 🔩