Modular Tetris Pixel Grid – 33mm Squares for 30LED/m Neopixel + ESP32-C3 BLE

This is the 3D printed display frame for my BLE-controlled Tetris demo project that I'm presenting at Maker Faire Prague.It converts a standard 30 LEDs/m WS2812 / Neopixel strip into large, clean 33 mm square pixels — the perfect size for a visible 10×20 Tetris playfield.Included Files:

• 1×1 Test Square – Print this first! It helps you check your printer tolerances and filament flow. The fit should not be tight.

• 5×5 Top Frame – Best printed with a filament swap: first 2 layers in translucent white, then switch to black. This creates beautiful glowing pixel windows with a sharp black grid.

• Back Panels – 5×5, 6×5, and 4×5 versions with:

  • Pins for the front frames to rest on

  • Hooks to guide and securely hold the LED strip

  • Designed for strong modular assembly

Recommended layout for full 10×20 Tetris matrix:

• 8× (5×5 Front Frames)

• Back: 4× (4×5) + 4× (6×5) back panels
  (I staggered the overlaps on top and bottom edges for better structural bonding — works really well)

The top and bottom modules click together and become surprisingly rigid.Printing notes:

• Optimized for 30 LEDs/m strips (33 mm square size)

• PLA works great

• No supports needed

• Translucent white + black mid-print ( 2 layer white rest black ) swap on fronts is highly recommended for the best look

Electronics & Code:

• ESP32-C3 board

• 30 LEDs/m Neopixel strip

• Controlled over Bluetooth Low Energy (BLE)

Full code and project details are available here:
https://github.com/Hahihula/esp-ble-nostd-tetris
Great project for Maker Faires, desks, or retro gaming setups. Feel free to remix!
Happy printing and may your Tetrominos always fall in the right place!