OpenSCAD have two missing things when you export a DXF file :

• no support for polylines
• no support for layers

No worries, the odmt tool tries to fill this gap. Written in Python with the help of the ezdxf library, odmt takes as argument one or more paths to DXF files and/or one or more paths to directories containing DXF files to merge together, each file is merged into a separate colored layer. On top of that, odmt converts all continuous segments (LINE) into a single polyline. More options explained below.

This is my first python program, be cool and suggest improvements, thanks.

Simply copy the odmt script (odmt.py) to your favorite location and install the ezdxf library.

pip install ezdxf

or more simple clone the repository (the ezpdf library is packed with)

git clone https://github.com/lautr3k/odmt.git

usage: odmt [-h] [--input path [path ...]] [--output path]
            [--search pattern [pattern ...]] [--ignore pattern [pattern ...]]
            [--colors index [index ...]] [--nolayers] [--version]

OpenSCAD DXF Merge Tool (odmt) - v1.0.0

optional arguments:
  -h, --help            show this help message and exit
  --input path [path ...], -i path [path ...]
                        input file or directory - default: [./input]
  --output path, -o path
                        output file - default: ./output/merged.dxf
  --search pattern [pattern ...]
                        search file pattern - default: [*.dxf]
  --ignore pattern [pattern ...]
                        ignored file/directory pattern - default: [*_ignore_*]
  --colors index [index ...]
                        layers indexed colors - default: [10, 20, 30, 40, 50,
                        60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160,
                        170, 180, 190, 200, 210, 220, 230, 240]
  --nolayers            if set, all files will be merged into the same layer
  --version, -v         show program's version number and exit

By default odmt is looking for a input and a output folder at the working directory.

• Create the input folder and copy into it the DXF files you want to merge together.
• Create the output folder.
• Execute the odmt tool.
• And show the result at ./output/merged.dxf.

One or more files :

odmt --input path/to/file1.dxf path/to/file2.xdf

Mixing files an directories :

odmt --input path/to/dir1 path/to/file1.xdf path/to/dir2

Directories is allways scanned recursively.

Set the new output file path (with the extension) :

odmt --output new/output/destination.dxf

Merge only files matching .dxf file extenssion :

odmt --search *.dxf

Merge only files matching customs .merge.dxf and .scad.dxf file extenssions :

odmt --search *.merge.dxf *.scad.dxf

Ignore all files wite .ignore.dxf extenssion :

odmt --ignore *.ignore.dxf

Ignore all dxf files stating by a _ and all files/directories containing backup and/or old keywords in here name :

odmt --ignore _*.dxf *backup* *old*

Set the indexed layers color table :

odmt --colors 1 2 3 20 90

See AutoCAD Color Index for an complete list.

Merged all files into the same layer :

odmt --nolayers

By passing a single input file to odmt it is possible to just convert is continuous LINE to POLYLINE.

Convert and save a new file :

odmt --input file.dxf --output new_file.dxf

Convert and overwrite the old file :

odmt --input file.dxf --output file.dxf