Need this made?
CDI Motorsport CNC cuts, folds, tube-copes and fabricates from exactly these files. Send us the details of what you just opened and we will quote it — laser/plasma profiles from DXF/DWG, formed sheetmetal, machined parts and full fabrication from STEP.
About this viewer
Which files can I open?
STEP (.step/.stp, AP203/AP214/AP242), IGES (.iges/.igs), STL (binary or ASCII), DXF (all common entities — lines, polylines with arcs, circles, arcs, ellipses, splines, blocks, dimensions and text) and DWG (R13 through 2018). Solid models are shown shaded with feature edges; DXF/DWG are shown as a 2D drawing with layers.
Is my file uploaded anywhere?
No. Everything runs inside your browser. The STEP and DWG readers are open-source engines (OpenCascade and LibreDWG) compiled to WebAssembly and downloaded from a CDN the first time you use them — your file itself never leaves your computer.
Why does STEP or DWG take a moment to open the first time?
The STEP reader is about 8 MB and the DWG reader about 10 MB. They download once and are cached by your browser; after that files open in a second or two. STL and DXF open instantly.
How accurate is the measurement?
Measurements snap to model vertices (mesh corners, line endpoints, arc ends) and report straight-line distance plus the X/Y/Z components in millimetres. STEP geometry is exact; STL and tessellated curves are only as accurate as the mesh.
Can I print at true scale?
Yes. Pick 1:1 (or any standard scale) and choose 100% / actual size in the print dialog. DXF/DWG drawings print as crisp vector line-work; 3D models print as shaded views with edges. The title block states the scale used.
Where is the origin and which way is up?
Models are shown exactly where they sit in the file — the grid is the XY plane, Z is up (the usual CAD convention). Front looks along +Y, Right looks along −X, Top looks down −Z, and the views on the printed sheet follow third-angle projection (AS 1100 / ISO).
