1. Product Overview
This building block set is designed with a universal connection system, ensuring compatibility with standard building blocks from various series. The product is crafted from food-grade ABS environmental protection plastic, free from harmful substances like bisphenol A (BPA) and phthalates. It has successfully passed international safety certifications including ASTM F963-23 (USA), EN 71 (EU), and GB 6675 (China), guaranteeing safe use.
1.1 Target Audience
- Small brick blocks (regular size): Suitable for children aged 14 and above, and adults.
- Large brick blocks (Duplo series size): Suitable for children aged 14 and above.
Note: Children aged 3-6 must be accompanied by adults during use.
2. Specifications
2.1 Basic Size Definition
- Lego Unit: 1 unit for small bricks = 8mm; 1 unit for large bricks = 16mm.
- Studs: Protruding connections on the top of blocks, with a diameter of 5.0mm and a center distance of 8.0mm between adjacent studs.
- Anti-studs: Grooves on the bottom of blocks for precise engagement with studs to achieve fixation.
2.2 Common Part Sizes (Small Bricks)
| Part Type | Specification (Length × Width × Height) | Actual Size | Application |
|---|---|---|---|
| Standard Brick | 2×4×1 | 31.8×15.4×12.7mm | Basic construction, structural support |
| Standard Brick | 2×2×1 | 15.9×15.9×12.7mm | Detail filling, small structures |
| Thin Plate | 1×2×1/3 | 15.8×7.7×3.2mm | Detail decoration, laminating reinforcement |
| Tile (Smooth Surface) | 2×4×1/3 | 31.8×15.4×3.2mm | Smooth surface decoration |
| Base Plate (Basic) | 32×32 studs | 25cm×25cm | Construction base, scene fixation |
| Base Plate (Large) | 48×48 studs | 38cm×38cm | Large scenes, multi-person collaborative construction |
2.3 Large Brick Sizes (Duplo Series)
- Standard 2×2 brick: 31.8×31.8×25.4mm (twice the size of small bricks).
- Basic base plate: 16×16 studs (25cm×25cm), specially designed for large bricks.
2.4 Package Dimensions and Weight
- Length: 38 cm
- Width: 25 cm
- Height: 13 cm
- Weight: 2.8 kg
3. Usage Guide
3.1 Preparations
- Part Classification: Unpack sequentially according to the bag labels in the manual (marked "Step 1-XX"). For unpackaged parts, it is recommended to store them by color and shape, and store special parts (gears, axles, ball joints) separately.
- Tool Preparation: Basic tools include a brick separator (for separating tightly fitted parts) and a soft brush (for cleaning dust). Optional parts sorting boxes and magnetic storage trays can improve efficiency.
- Environmental Requirements: Choose a spacious and flat tabletop or floor, preferably with a non-slip mat. Avoid using in humid or narrow areas.
3.2 Basic Assembly Skills
- Connection Method: Align the anti-studs of the upper block with the studs of the lower block, press vertically downward until fully engaged, and a "click" sound indicates successful fixation.
- Structural Reinforcement:
- Vertical Stacking: For every 5 additional layers, it is recommended to add horizontal supports (such as 1×2 plates) to enhance stability.
- Horizontal Splicing: Adopt the "interlocking structure" (upper bricks cover the gaps of lower bricks) to increase bending resistance by 30%.
- Use of Special Parts:
- Cross Pins: Select the appropriate size by comparing with the length marking in the manual.
- Movable Parts: Reserve a 1-2mm gap for ball joints to avoid jamming. Add 1 idler gear for every 5 gears in gear transmission to reduce wear.
3.3 Interpretation of Manual Symbols
| Symbol | Meaning | Operation Tips |
|---|---|---|
| Unnumbered | Special/large parts (without independent packaging) | Find and set aside before assembly |
| Arrow Guide | Hint for part installation angle | Align and splice according to the arrow direction |
| n times | Repeat assembly n times | Complete the same components in batches before overall assembly |
| Rotation Symbol | Need to adjust the angle for continued splicing | Rotate the part to the appropriate position |
| Length Mark | Comparison of cross pin lengths | Align the part with the mark to confirm the size |
3.4 Advanced Assembly Suggestions
- Color Matching: Follow the "7:2:1 Rule" (70% main color + 20% auxiliary color + 10% accent color) to avoid messy colors.
- Modular Construction: Split complex models into independent subsystems (foundation, main body, decoration) first, then assemble them as a whole to reduce error rate.
- Dynamic Structures: Balance flexibility and stability at the connection points of movable parts to avoid excessive looseness or tightness.
4. Safety Precautions
4.1 Usage Specifications
- Do not put blocks (especially small ones) into the mouth, nostrils, or ears to avoid suffocation risk.
- Do not use blocks as projectiles or weapons, and prohibit use during horseplay.
- Children aged 3-6 must be accompanied by adults during use, and unsafe behaviors should be corrected in a timely manner.
- Avoid playing while running or jumping to prevent falling and injury from stepping on scattered blocks.
4.2 Prohibited Scenarios
- Electronic parts (motors, battery boxes, sensors) are prohibited from contacting water sources to avoid short circuits, damage, and safety risks.
- Do not immerse assembled mechanical components (such as gearboxes) in water to prevent internal mold growth.
- Do not use metal tools to forcefully pry or disassemble parts to avoid fragmentation and sharp edges.
- It is not recommended to use blocks as decorations in aquariums or fish tanks.
4.3 Regular Inspection
- Inspect the integrity of blocks weekly. Immediately stop using and replace any damaged, cracked, or deformed parts.
- Store small and large bricks separately to prevent young children from accessing small bricks.
- If parts are lost, contact official customer service for replacement according to the part number in the manual's parts list.
5. Maintenance
5.1 Cleaning Methods
- Regular Cleaning: Soak in mild soapy water, wipe gently with a soft cloth or sponge. Avoid using chlorine bleach or strong corrosive cleaners.
- Gap Cleaning: Use a soft brush or a hair dryer on low temperature to clean dust in part gaps.
- Thoroughly dry after cleaning to prevent moisture residue and bacterial growth.
5.2 Storage and Preservation
- Store in a dry and well-ventilated place to avoid part aging due to humid environments.
- Use sorting boxes or storage bags to organize parts by type to prevent loss.
- Avoid direct sunlight to prevent color fading and material embrittlement.
- For long-term non-use, it is recommended to disassemble large assembled models to reduce part fatigue and wear.
5.3 Service Life
- Under normal use conditions, the blocks can maintain good performance for many years. They have passed rigorous bite strength, impact, and pressure tests (can withstand 15kg pressure and 1.5m drop impact).
- Avoid long-term heavy pressure or high-temperature environments to extend service life.
6. Troubleshooting
If you encounter any issues during assembly or use, please refer to the following common problems and solutions:
- Missing Parts: In some instances, users have reported missing pieces or incorrect bag contents (e.g., duplicated bags, missing specific numbered bags). Carefully check all bags against the parts list in your manual. If parts are missing, please contact customer service for assistance.
- Incorrect Colors: Some parts may have slight color variations or be an incorrect color compared to the intended design (e.g., character arms). While this is rare, if it significantly impacts your build, contact customer service.
- Part Fitment Issues: If certain parts, such as minifigure bases or decorative elements, do not fit as expected or differ from standard designs, try to adjust gently. If a part is clearly defective or incompatible, contact customer service.
- Sticker Application: If a sticker is provided for a piece that is not the correct shape (e.g., a circular sticker for an oval piece), it may not apply properly. Consider if the aesthetic impact is acceptable or if an alternative solution can be found.
7. User Tips
- Pre-sort Parts: Before starting assembly, consider sorting all parts by color and type, especially for unpackaged pieces. This can significantly speed up the building process and reduce frustration.
- Verify Bag Contents: Double-check the contents of each numbered bag against the manual's parts list for that step to identify any potential missing or incorrect parts early.
- Handle Minifigures Carefully: Some minifigure details, such as hair or facial features, might have minor imperfections. Handle them gently during assembly.
- Consider Part Replacements: If you encounter missing or incorrectly colored parts, and customer service cannot provide replacements, you may consider sourcing compatible pieces from third-party vendors if the issue is critical to your build.
- SKU Variations (A, B, C, D): The different SKU options (A, B, C, D) typically refer to variations in packaging or minor regional differences, but the core 3402-piece model remains the same across these options.
8. Warranty and Support
8.1 Executive Standards
This product complies with the following standards:
- GB 6675-2014 (China)
- ASTM F963-23 (USA)
- EN 71 (EU)
8.2 Customer Support
For part replacement, technical consultation, or creative inspiration, please contact our customer service hotline. Refer to the product packaging or seller's information for specific contact details.
A digital version of this user manual is available for download: User Manual (PDF)
8.3 Copyright Statement
This product follows universal connection standards and is designed for compatibility. It is not an official product of the Lego brand.