Convert MI to DXF

A supplier, drafting application, CAM system, or cutting machine may require DXF instead of the original MI drawing. Converting it preserves usable 2D geometry for exchange, but the correct software depends on whether the file came from ME10/Creo Elements/Direct Drafting or MEDUSA4.

What the MI format is

MI is not one universal file format. The extension is commonly associated with native 2D drawings from ME10 and CoCreate Drafting, now sold as PTC Creo Elements/Direct Drafting; MEDUSA4 from CAD Schroer also uses MI drawing files. These dialects are not automatically interchangeable.

ME10 and Creo Elements/Direct MI files can contain drafting geometry, dimensions, text, hatching, layers, symbols, and drawing attributes. MEDUSA4 MI files can contain comparable mechanical-drafting information. Check the originating program, file header, drawing documentation, or the person who supplied the file before selecting a converter. Renaming drawing.mi to drawing.dxf changes only the filename and does not convert the data.

What the DXF format is

DXF is Autodesk's Drawing Exchange Format, intended to transfer CAD data between applications. AutoCAD, DraftSight, BricsCAD, LibreCAD, many CAM systems, and laser, plasma, and CNC preparation tools can read common DXF versions.

DXF is suitable mainly for 2D entities such as lines, arcs, circles, polylines, text, layers, and hatch boundaries. It usually does not retain native parametric constraints, associative dimensions, proprietary symbols, application metadata, or the complete MEDUSA or Creo drawing structure.

How to convert an ME10 or Creo MI file

1. Keep an untouched copy of the original .mi file and identify the program that created it. Use PTC Creo Elements/Direct Drafting or a compatible ME10 release for ME10/CoCreate files; do not assume MEDUSA4 can open them.
2. Open the drawing in the originating or compatible drafting application. If an old-release compatibility or migration prompt appears, complete it on a working copy and save the migrated file separately.
3. Check units, scale, sheet size, layers, line styles, fonts, external symbols, and referenced data. Resolve missing references and confirm that the drawing regenerates correctly before export.
4. Use the installed DXF translator or export command, commonly exposed through File → Save as, File → Export, or an ME10/Creo DXF export command. Menu names and command availability vary by release and license, so use the version's documentation if no DXF option appears.
5. Choose a DXF release supported by the receiving CAD or CAM system. Select 2D geometry or standard entities rather than proprietary or proxy objects when the translator offers that choice. Set the output units, scale, layer mapping, text substitutions, and model-space or paper-space behavior.
6. Save to a new filename such as drawing_export.dxf. Open that file in the destination application, rather than judging the conversion only from the export dialog.

How to convert a MEDUSA4 MI file

Open a MEDUSA4 MI file in MEDUSA4 and use its installed DXF/DWG interface or export function. Select the target DXF version and configure units, layers, fonts, symbols, and 2D entity output. MEDUSA4's own translator is preferable because it understands MEDUSA-specific drawing data; a ME10 translator is not a substitute.

MEDUSA4 and Creo Elements/Direct Drafting are separate CAD systems. A converter that supports one MI dialect may reject the other or produce incomplete geometry. CAD Schroer support, PTC support, or an authorized CAD conversion service can identify the dialect and create a test export when the source application is unavailable.

Online and batch conversion options

General file-conversion websites should not be treated as MI converters unless they explicitly identify the source as the required ME10/CoCreate or MEDUSA4 MI dialect. Many services support DXF as an output but do not parse MI, and uploading engineering drawings may breach confidentiality or customer requirements. For a cloud workflow, obtain written confirmation of MI support and test one non-sensitive drawing first; otherwise use the originating desktop software or a CAD conversion bureau. A batch export is appropriate only after a sample has passed visual and dimensional checks.

Quality and compatibility checks

Export may flatten associative dimensions, substitute fonts, omit custom symbols, change hatch patterns, split or join entities, and discard non-graphical attributes. Measure a known feature in the DXF and compare it with the MI source; unit and scale mismatches are common.

For CNC, laser, plasma, or profile cutting, inspect contours for gaps, duplicate entities, self-intersections, open polylines, unwanted construction geometry, and incorrect arc direction. Confirm the receiving system's required DXF version and accepted entities before export, because some systems reject splines, proxy objects, 3D entities, or newer DXF syntax.