Remove construction lines from dxf files exported from Fusion360

remove_fusion_construction.py

import ezdxf
import sys
import os

# Removes all construction lines from a dxf file exported from Fusion360

# You may need to run:
# pip install ezdxf

# Usage is:
# python remove_fusion_construction.py my_file.dxf
# The result will be saved in my_file_trim.dxf

def modify_dxf(input_file):
    try:
        # Derive the output file name
        base_name, ext = os.path.splitext(input_file)
        output_file = f"{base_name}_trim{ext}"

        # Read the DXF file
        doc = ezdxf.readfile(input_file)
        msp = doc.modelspace()

        # Delete all points
        points_to_remove = [entity for entity in msp.query('POINT')]
        for point in points_to_remove:
            msp.delete_entity(point)

        # Delete all entities on layer "1"
        entities_on_layer_1 = [entity for entity in msp if entity.dxf.layer == "1"]
        for entity in entities_on_layer_1:
            msp.delete_entity(entity)

        # Save the modified DXF to a new file
        doc.saveas(output_file)
        print(f"Successfully modified the DXF file. Saved as '{output_file}'.")
    except IOError:
        print("Could not read or write the file. Please check the file paths.")
    except ezdxf.DXFStructureError as e:
        print(f"Invalid DXF file structure: {e}")

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Usage: python remove_fusion_construction.py <input_dxf_file>")
        sys.exit(1)

    input_dxf = sys.argv[1]
    if not os.path.isfile(input_dxf):
        print(f"Error: The file '{input_dxf}' does not exist.")
        sys.exit(1)

    modify_dxf(input_dxf)