If you are ordering a metal part for the first time, file names can make the process feel more complicated than it needs to be. STEP and DXF are both ways to share a design, but they communicate different information in a typical sheet metal workflow.
The practical question is simple: are we cutting a flat shape, or cutting and bending it into a finished part? That determines the file KRAZO Laser needs.
One bracket, two useful viewsHere is the same simple bracket in two views. One shows the finished bent shape; the other shows its flat cutting profile before forming.
The red dashed bend reference is shown for teaching; it is not a laser cut. These are simplified illustrations, not production-ready CAD files. The actual flat pattern depends on the material and forming setup.
What is a DXF file?
DXF stands for Drawing Exchange Format. It shares drawing information between CAD programs. For our flat laser-cutting work, a DXF contains the two-dimensional outline and cut features of a part.
Picture a mounting plate lying flat on a table. A suitable DXF shows the plate’s outside boundary, bolt holes, and slots at their actual size.
DXF can contain more than 2D geometry, depending on how it is created. For KRAZO’s flat cutting workflow, send a clean 2D cutting profile. A screenshot or a PDF image of that profile does not supply the same editable geometry.
Autodesk documents DXF export for sheet metal flat patterns.
When a DXF is enough
A DXF is fine when the finished part stays flat and the job only requires laser cutting. Include the material grade, thickness, quantity, and any critical requirements with the file.
What is a STEP file?
STEP stands for Standard for the Exchange of Product model data. It is a widely used format for moving model information between different CAD systems. Common file endings are .step and .stp.
For formed parts, the 3D STEP model shows the intended finished shape: thickness, flanges, bends, and the positions of features in space.
Imagine turning a bent bracket around in your hand. A 3D model lets our team inspect that shape from different views. A flat cutting outline alone cannot provide the same view of the finished bracket. Autodesk’s STEP format reference explains its role in exchanging model data.
STEP vs DXF at a glance
Swipe or scroll sideways to compare both columns.
| Question | DXF cutting profile | 3D STEP model |
|---|---|---|
| What does it show? | A flat outline, holes, and slots. | The intended three-dimensional part. |
| Typical KRAZO use | Flat parts requiring only laser cutting. | Parts requiring press brake forming. |
| Shows the finished bends? | A flat profile alone does not. | Yes, when exported as the formed model. |
| What else should I send? | Material, thickness, quantities, and a PDF for important notes. | The same details, plus critical bend and formed dimensions. |
Why KRAZO requires a 3D STEP file for formed parts
When metal bends, the relationship between the flat blank and the finished dimensions depends on the material and forming process. The flat pattern is the shape cut before bending; it must support the intended finished part.
A 3D STEP file helps our team review bend direction, flange lengths, clearances, and how features relate after forming. It also helps identify designs that need more discussion before they can be quoted or made.
Example: two flat blanks may look similar but form into different brackets because the bends face different directions. Send the formed STEP model so the intended result is clear.
Even if you already have a flat DXF for a bent part, send the formed 3D STEP file as well. A STEP containing only a flat sheet does not communicate the finished bends.
Include a dimensioned drawing identifying critical measurements, bend angles, radii, tolerances, and revision. The model supplies geometry; the drawing communicates requirements that may not be carried in the file.
Before you send your files
For a flat laser-cut part
- Export the DXF at 1:1 scale and state whether dimensions are inches or millimeters.
- Use complete, closed cutting contours; remove duplicate or overlapping lines.
- Keep dimensions, notes, and borders separate from the cutting geometry.
- Identify the material grade, thickness, quantity, and part revision.
For a formed part
- Export a 3D STEP of the finished formed shape.
- Check that the model opens correctly and represents the right thickness and revision.
- Include a dimensioned PDF with important bend and assembly requirements.
- Identify each part clearly when sending multiple components.
For either job
Tell us about deburring, welding, hardware, finish, requested delivery date, and shipping destination. Use matching part numbers and revisions across the model, drawing, and quote request.
Do not rename a file to convert it. Changing “part.pdf” to “part.dxf” does not create CAD geometry. Use your CAD software’s export function or ask the designer for the required format. If you only have a sketch or PDF, send it and explain what you have so we can discuss what is needed.
Ready to have parts made? Explore laser cutting and press brake forming, then request a quote. Email drawing files and job details to quotes@motobilt.com.