Problems to be fixed: add a mesh repair functions

CNC Manufacturability Analyzer

A modular Python framework for analyzing STL files for CNC manufacturability issues.

Features

• Modular Architecture: Each analysis function is in its own module
• Context-Aware Analysis: Smart detection that ignores false positives
• Interactive Web Interface: Streamlit-based UI for easy file upload and analysis
• Comprehensive Reporting: HTML, JSON, and Markdown report generation
• 3D Visualization: Interactive Plotly visualizations with problem highlighting
• Test Framework: Built-in testing system for validating analysis functions

Analysis Modules

1. undercut_check.py: Detects surfaces that can't be machined from standard directions
2. internal_volumes_check.py: Finds enclosed spaces that can't be accessed
3. steep_walls_check.py: Identifies problematic vertical walls in deep pockets
4. narrow_channels_check.py: Detects channels too narrow for standard tools
5. small_features_check.py: Finds features smaller than minimum tool size
6. deep_pockets_check.py: Identifies pockets that may be too deep for standard tools
7. geometric_context.py: Provides context-aware analysis helpers

Installation

pip install -r requirements.txt

Usage

1. Web Interface (Recommended)

streamlit run app.py

Then:

• Upload your STL file
• Configure analysis parameters
• Select which analyses to run
• View results and download reports

2. Command Line

from cnc_analyzer import CNCAnalyzer

# Create analyzer
analyzer = CNCAnalyzer()

# Load mesh
analyzer.load_mesh("your_part.stl")

# Run single analysis
result = analyzer.analyze_single_function("undercuts")

# Run all analyses
results = analyzer.analyze_all()

# Get score
score = analyzer.calculate_score()
print(f"CNC Manufacturability Score: {score}/100")

3. Test Framework

from test_framework import TestFramework

# Create tester
tester = TestFramework()

# Create synthetic test cases
tester.create_test_cases()

# Run tests on all cases
results = tester.test_all_cases()

# Generate comparison report
summary = tester.generate_comparison_report(results)

Configuration

Default configuration in cnc_analyzer.py:

{
    'min_tool_diameter': 3.0,      # mm
    'min_channel_width': 2.0,      # mm
    'steep_angle_threshold': 80.0,  # degrees
    'deep_pocket_threshold': 30.0,  # mm
    'min_depth': 5.0,              # mm
    'use_context_aware': True,
    'analysis_methods': {
        'undercuts': True,
        'internal_volumes': True,
        'small_features': True,
        'steep_walls': True,
        'narrow_channels': True,
        'deep_pockets': True
    }
}

Scoring System

• 90-100: Excellent - Perfect for standard CNC
• 80-89: Good - Minor issues, easily machinable
• 70-79: Fair - Some challenges, may need special tools
• 50-69: Difficult - Requires advanced CNC or redesign
• 0-49: Very Difficult - Major redesign recommended

Adding Test Cases

Place STL files in the test_cases directory and run:

tester = TestFramework("test_cases")
results = tester.test_all_cases()

Report Types

1. HTML Report: Comprehensive report with visualizations
2. JSON Report: Machine-readable format for integration
3. Markdown Report: Human-readable text format

Context-Aware Analysis

The analyzer includes smart detection that:

• Ignores external surfaces (they're good for CNC)
• Checks tool accessibility from multiple directions
• Considers geometric context before flagging issues
• Reduces false positives from mesh tessellation

Extending the Framework

To add a new analysis:

1. Create a new module (e.g., new_check.py)
2. Implement analysis function following the pattern:

   def analyze_new_feature(mesh, **kwargs):
       return {
           'count': count,
           'indices': indices,
           'has_problem': bool,
           'severity': level,
           'data': metadata
       }

3. Add to CNCAnalyzer.analyze_single_function()
4. Update scoring logic in calculate_score()

citation

@software{trimesh, author = {{Dawson-Haggerty et al.}}, title = {trimesh}, url = {https://trimesh.org/}, version = {3.2.0}, date = {2019-12-8}, }