Here's a detailed description in English for your battery holder model on Maker World:

---

**21700 Battery Holder Model**

This 21700 battery holder is designed to securely hold cylindrical batteries with a diameter of 21mm and a length of 70mm. The holder is engineered to maintain a precise 23mm distance between the centers of each battery cell, ensuring optimal spacing for both electrical connections and thermal management.

**Key Features:**

1. **Precise Cell Spacing:** The holder maintains a 23mm center-to-center distance between the battery cells, which is critical for proper alignment and space efficiency in various applications.

2. **Material:** The model is designed to be 3D printed using PET (Polyethylene Terephthalate) filament, known for its strength, durability, and resistance to various environmental factors.

3. **Secure Fit:** The holder's design ensures a snug fit for 21700 cells, preventing movement and potential short circuits.

4. **Easy Assembly:** The structure allows for easy insertion and removal of batteries, making it user-friendly for both hobbyists and professionals.

5. **Versatile Use:** Ideal for use in custom battery packs for electronics projects, electric vehicles, power tools, and other applications requiring reliable and compact battery management.

**Printing Instructions:**

- **Material:** PET filament

- **Layer Height:** 0.2mm for optimal strength and detail

- **Infill:** 20-30% to balance durability and material usage

- **Supports:** Not required, designed to be printed without supports

- **Print Orientation:** Print the holder lying flat to ensure the best structural integrity and ease of printing.

**Application:**

This battery holder is perfect for makers and engineers looking to build custom battery packs for projects involving Arduino, Raspberry Pi, or other microcontroller platforms. Its robust design and easy assembly make it a practical addition to any electronics lab or DIY project toolkit.

---

Feel free to modify this description as needed to better fit your specific requirements or to add any additional features unique to your model.