snapmark 2.2.0

Python library for automated DXF file marking and manipulation to engrave your cut files

SnapMark

SnapMark is a Python library for applying intelligent, customizable text markings and engraving paths on DXF (AutoCAD) files. It is designed to generate laser-engraving traces (not cutting paths) that make each part identifiable through incised labels, codes, and metadata. Markings are rendered as vector segments (polylines), not DXF text entities — ensuring compatibility with CAM software that reads geometry, not fonts. Built on top of the excellent ezdxf, it provides a simple API for marking, alignment, hole analysis, and batch processing — tailored for manufacturing, CNC workflows, and automated drawing preparation.

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⚠️ Unit & Scale Notice

SnapMark is designed for sheet-metal parts measured in millimeters.

Since DXF files may contain arbitrary units (meters, inches, kilometers, or undefined scale), loading a drawing in a different unit system may produce text markings that appear extremely large, extremely small, or misplaced.

If your DXF is not in millimeters, you must rescale it before processing, or the resulting engraving paths may not match the actual geometry.

⚠️ 3D Geometry Notice

SnapMark works exclusively with 2D DXF geometry. If the drawing contains 3D entities (non-zero Z values, 3D polylines, meshes, solids, or blocks with elevation), SnapMark will refuse processing to avoid unpredictable text placement.

Please ensure your DXF is flattened before use.

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Installation

pip install snapmark

Quick Start

import snapmark as sm

# Mark all DXF files with their filename
sm.mark_by_name("path/to/drawings")

# Custom sequence: filename + folder name
seq = (sm.SequenceBuilder()
       .file_name()
       .folder(num_chars=2)   # firts 2 chars of folder name
       .build())

sm.mark_with_sequence("path/to/drawings", seq, scale_factor=100)

Features

• ✅ Simple API - Mark files in a single function call
• ✅ Custom sequences - Combine filename parts, folder names, literals, and custom logic
• ✅ Automatic Alignment - Normalize orientation before marking
• ✅ Batch Processing - Process folders and subfolders with IterationManager
• ✅ Backup System - Automatic .bak creation and restoration
• ✅ Hole Utilities - Fast hole detection and counting for quality checks
• ✅ Extensible Architecture - Add your own operations and processing steps

Use Cases

• Manufacturing: Add part numbers and quantities to production drawings
• CAM workflows: Automatically mark drawings before CNC processing
• Quality control: Count holes and verify drawing specifications
• Batch processing: Apply consistent markings across large drawing sets

API Overview (Essentials)

Shortcuts (Simple Usage)

• mark_by_name(folder) - Mark with filename
• mark_by_split_text(folder, separator, part_index) - Mark with filename part
• mark_with_sequence(folder, sequence) - Mark with custom sequence
• quick_count_holes(folder, min_diam, max_diam) - Count holes
• restore_backup(folder) - Restore from backups
• process_single_file(file, *operations) - Pipeline on single file

Mark with a custom sequence

import snapmark as sm

# Build custom sequence
seq = (sm.SequenceBuilder()
       .file_name()
       .file_part(separator="_", index=0)
       .folder(num_chars=2)
       .literal("TEXT")
       .custom(lambda folder, file: "X")
       .set_separator("-")
       .build())

# Apply sequence to all DXF files
sm.mark_with_sequence(
    folder=r"C:\DXF",
    sequence=seq,
    scale_factor=100,
)       

Run operations on a single file

import snapmark as sm

seq = sm.SequenceBuilder().file_name().build()

sm.single_file_pipeline(
    r"C:\DXF\part.dxf",

    sm.Aligner(),

    sm.AddMark(
        sequence=seq,
        scale_factor=100,
    ),

    use_backup=True
)

Operations (Advanced)

• AddMark(sequence) - Add a numeric/alphanumeric marking rendered as vector segments (CAM-ready engraving paths)
• AddText(texts) - Add a DXF MTEXT entity (native text, not vectors — CAM support may vary)
• Aligner() - Aligns the drawing along its longest side in the X direction.
• CountHoles(find_func) - Count circles
• AddX(find_func, x_size) - Add X marks
• RemoveCircle(find_func) - Remove circles
• SubstituteCircle(find_func, new_radius) - Replace circles

Build a custom batch pipeline

import snapmark as sm

manager = sm.IterationManager(r"C:\DXF")

manager.add_operation(
    sm.Aligner(),
    sm.AddMark(
        sequence=(
            sm.SequenceBuilder()
            .file_name()
            .build()
        )
    ),
        sm.TrimBendLines(
        layers="Bend",
        start_length=10,
        end_length=10,
        center_length=5,
    ),
)

manager.execute()

📘 Documentation: (Documentation files will be available in the docs/ directory.)

Requirements

• Python 3.10+
• ezdxf >= 1.0.0

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

MIT License - see LICENSE file for details.

Author

Federico Sidraschi
LinkedIn | GitHub

Acknowledgments

Built with ezdxf - the excellent DXF library for Python.

Examples

SnapMark comes with a set of ready-to-run examples located in the examples/ folder.
These examples demonstrate common operations, including restoring backups, counting holes, and basic marking.

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Keywords: DXF, CAD, AutoCAD, marking, automation, batch processing, manufacturing, CNC, CAM