3D printing is a rapid prototyping system that creates objects by layering powder or liquid adhesive materials. It belongs to the category of additive manufacturing.3D printing uses a "bottom-up" approach based on the principle of "discrete accumulation." Unlike traditional subtractive manufacturing, it incrementally adds material in layers to form solid parts.
The 3D printer used in this time is personal, Creality CR-200B, which is small in size and cost-effective, suitable for family, school and other occasions. FDM is the full name of melt deposition molding, which was developed in 1988 by Scott Crump of the United States.
CR-PLA is a high-performance polylactic acid material with high strength, high toughness, excellent surface gloss and low warpage rate, suitable for education, creative design and functional prototyping, easy to use and environmental protection, and beautiful printing effect.
Install Creality Slicer & 123 Design
Add printer in Creality CR-200B
| Layer Height | 0.1mm | 0.2mm | 0.3mm |
|---|---|---|---|
| Material Usage (g) | 4g | 4g | 4g |
| Print Time | 48min | 26min | 18min |
| Surface Finish | Very smooth, almost no stair-step effect | Fairly smooth, slight stair-step effect | Rough, noticeable stair-step effect |
| Detail Representation | Clear details, suitable for complex models | Good details, suitable for most applications | Lost details, not suitable for fine models |
| Use Case | High-precision parts, detailed models, products with high appearance requirements | Everyday printing, balancing speed and quality | Quick prototyping, efficiency-focused projects |
| Shell Thickness (mm) | Printing Performance | Structural Strength | Use Case |
|---|---|---|---|
| 0.4 mm | Incomplete or uneven shell | Weak, prone to deformation or breakage | Ultra-lightweight models |
| 0.8 mm | Good shell uniformity | Moderate strength, suitable for most daily applications | Daily use applications |
| 1.2 mm | Stronger shell, smoother appearance | High strength, good compression and tensile resistance | Daily use applications |
| 1.6 mm | Very strong shell, almost no deformation | Very high strength, suitable for high-strength requirements | Functional parts or high-strength requirements |
| Infill Density (%) | Printing Performance | Structural Strength | Use Case |
|---|---|---|---|
| 5%-10% | Very lightweight, sparse filling, may be incomplete | Lowest strength, prone to deformation or breakage | Ultra-lightweight models |
| 20% | Balance of weight and strength, common default value | Moderate strength, suitable for most daily applications | General-purpose parts |
| 50%-80% | Dense filling, strong structure, nearly solid | High strength, suitable for functional components | Functional parts |
| 100% | Fully solid, strongest | Maximum strength, suitable for extreme load-bearing | Structural components, special purposes |
| Print Speed (mm/s) | Printing Performance | Surface Quality | Structural Strength | Use Case |
|---|---|---|---|---|
| 20-40 mm/s | Long print time, material extrusion is sufficient | Smooth surface | Strong | High-detail models |
| 60 mm/s | Moderate print time, stable performance | Slightly rough but acceptable | Moderate | Rapid prototyping, general-purpose parts |
| 80 mm/s | Significantly reduced print time, minor quality issues may occur | Possible stringing or slight roughness | Weaker | Fast prints |
| 100 mm/s | Shortest print time, significant quality issues may occur | Rough surface, noticeable defects possible | Very weak | Extreme speed testing |
A comprehensive all-in-one test model was downloaded from Thingiverse.
3D printed test model
| Test Type | Purpose | Test Content | Evaluation Results | Test picture |
|---|---|---|---|---|
| Overhang Test | To test the printer's ability to print overhang structures at different angles | Angles include (10°/20°/30°/40°/50°/60°/70°/80°) and (15°/30°/45°/60°/75°) | At 70°-80° overhangs, there is sagging in the inner layers; this can be improved by increasing the cooling fan speed. | 
|
| Bridging Test | To evaluate the printer's ability to print suspended structures across horizontal spans | Lengths vary (2mm/5mm/10mm/15mm/20mm/25mm) | The bridges did not collapse and showed no significant sagging; all conditions were good. | 
|
| Diameter Test | To test the accuracy of cylindrical or columnar object diameters during printing | Design: 4mm / 6mm / 8mm / 10mm Actual: 3.89mm / 5.95mm / 7.89mm / 9.94mm |
Average diameter error: 0.0825mm | 
|
| Hole Test | To assess the dimensional accuracy and shape precision of circular holes | Design: 4mm / 6mm / 8mm Actual: 3.85mm / 5.8mm / 7.88mm |
Average hole error: 0.1567mm | 
|
| Support Test | To evaluate the effectiveness of support structures and the surface quality after removal | L-shaped supports | The slight gap in the support is nice, but seems too tight to remove easily. | 
|
| Precision Test | To test dimensional accuracy in two dimensions (horizontal and vertical) | Design: 30mm / 20mm / 10mm Horizontal: 30.33mm / 20.45mm / 10.37mm Vertical: 30.36mm / 20.69mm / 10.52mm |
Horizontal average error: 0.3833mm Vertical average error: 0.5233mm |
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A 3D scanner captures the three-dimensional geometry of an object through digital technology. The principle includes:
POP3The POP3 3D scanner is an efficient and accurate 3D scanning device that quickly captures the 3D geometry of objects and generates high-quality point cloud data.
windowsRevoScan5
Scanning, point cloud editing, grid editing, mapping
4.2.1 Model black and white mode, no subsequent texture mapping.
4.2.2 Model color mode, then direct texture mapping
4.2.3 Self modeling
With the help of Goertek colleagues, we completed the model calibration, full-range photography of the human body, camera parameter calculation, model training, mesh reconstruction optimization, texture generation, and finally obtained the full-body scan model
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