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PRT STL
File conversion

Convert PRT to STL

Verified by Adam B.· reviewed by FE Editorial ·updated Aug 1, 2026
QUICK ANSWER
Is it possible to convert PRT to STL?
Yes - PRT converts to STL.

In Creo, use File > Save As > Save a Copy and select STL; adjust chord height for surface smoothness. Without Creo, open the .prt in the free CAD Assistant or in Autodesk Fusion 360 and export STL from there. STL is the standard delivery format for 3D printers and slicing software.

8 programs
Also to STL: P21 · MEB · STEP

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert PRT to STL?

3D printers and slicing software read STL, not native CAD formats. When a Creo-designed part needs to go to a printer or a print service, STL is the standard hand-off format. The conversion is straightforward because the .prt already contains a solid 3D model that requires no additional modeling work before exporting.

How to convert PRT to STL

Pro/Engineer (Creo Elements/Pro) APP

Open the .prt in Creo, go to File > Save As > Save a Copy, select STL (*.stl), and adjust the chord height setting - lower values produce a finer mesh for better curved surfaces.

CAD Assistant FREE

Open the .prt in CAD Assistant (opencascade.com), then go to File > Export, select STL, and choose a mesh quality level (Rough / Medium / Fine / Custom).

Autodesk Fusion 360 FREE

Import the .prt in Fusion 360, right-click the body in the browser panel and choose Save As Mesh, set format to STL and structure to Binary, and set refinement to High for curved surfaces.

Programs that convert PRT

CrossManager
PolyTrans|CAD+DCC
SolidWorks
Pro/Engineer (Creo Elements/Pro)
3ds Max (3D Studio Max)
TransMagic
EnSuite
Online CAD converter

About these formats

.PRT PTC Creo / Pro-ENGINEER Part File

A PRT file is a single 3D part created by PTC Creo Parametric (formerly Pro/ENGINEER). To open it without buying Creo, use the free PTC Creo View or eDrawings viewer. To move the part to…

Open .PRT details →
.STL Stereolithography / Standard Tessellation Language file

An STL file is a 3D model that describes a shape as a mesh of triangles. To view it, use Microsoft 3D Viewer (Windows) or Quick Look (macOS). To 3D-print it, open it in a slicer like…

Open .STL details →

Quality & what to watch

  • STL is a triangle mesh - it carries no parametric features, sketches, dimensions, or materials; keep the original .prt if you need to modify the part later.
  • Mesh resolution matters for curved surfaces: use Fine or High quality in CAD Assistant or Fusion 360, or lower the chord height in Creo, to minimize visible faceting.
  • Export as Binary STL rather than ASCII - Binary produces a much smaller file and is accepted by all slicing software.

Frequently asked questions

Can I edit the STL file later?
Not parametrically - STL is a triangle mesh with no feature history; keep the original .prt for any future modifications.
What mesh quality setting should I use for 3D printing?
Use Fine or High in CAD Assistant or Fusion 360, or reduce the chord height in Creo, to ensure curved surfaces print smoothly.
Should I export ASCII or Binary STL?
Binary - it produces a much smaller file and is accepted by all slicers, while ASCII offers no functional benefit.
Can I convert without a Creo license?
Yes - CAD Assistant (free, cross-platform) and Autodesk Fusion 360 (free personal-use tier) both read Creo .prt files and export STL.