Submitting STEP files: how to do it right

A well-structured STEP file (.step or .stp) is the fastest route to an accurate quote and flawless production. In practice, however, we regularly see files that are incomplete, poorly structured or difficult to process. Based on our daily experience with sheet laser cutting, tube laser cutting and bending, we’ve listed the most important points of attention for you.

What is a STEP file?

STEP is a neutral 3D file format and the industry standard for exchanging CAD models between different design packages. It allows us to translate your design quickly and without loss of shape or tolerances into a cutting, bending or folding program. For simple, flat sheet metal work without bending, a DXF file can sometimes suffice, but our preference always goes to a correctly structured STEP file.

Checklist: how to submit a good STEP file

Keep the points below in mind when building your 3D model. This way we can process your file correctly the first time and you avoid delays in quoting and production.

1. Correct scale and unit

Always draw and export your model at a 1:1 scale and in millimetres. With a different scale or unit, parts may be read incorrectly, which can result in incorrect dimensions.

2. A technically correct 3D model

Submit a fully closed solid, free of loose, duplicate or overlapping surfaces and with a consistent wall thickness. Also clearly indicate which side is the visible side of the product and preferably export in STEP AP214 or AP242, so that all product information is preserved.

3. Only the relevant geometry

Remove construction lines, sketches, reference planes and axes, and embedded text or dimensions from the file. The cleaner the model, the faster and more accurately we can process it.

4. Engravings and markings

Would you like an engraving or marking on the product? Draw it recessed by 0.1 mm and at least 0.3 mm wide, and only on one side of the part.

5. Clear file name and revision number

Give your file a clear, recognisable name and increase the revision number with every change. This way, even with multiple revisions, we always work with the correct version of your design.

6. Additional point of attention for tube laser work

Having your parts tube laser cut? Then accurately draw the complete tube or box profile in the STEP file, including all laser cuts, holes and cutouts around the tube.

A well-structured STEP file pays off at every stage: a sharper and faster quote, fewer correction rounds, a shorter lead time and a lower chance of errors. Not sure whether your file meets the requirements? Feel free to contact our engineers — we’re happy to think along with you.