Convert SLDPRT
to 3MF.

Updated 2026-10-19

To convert SLDPRT (.sldprt) to 3MF (.3mf), drop the file below and download the result, in the browser with nothing installed. The part opens and comes back as a 3MF mesh, with nothing installed.

5 conversions a day with no account. No card, no install, no CAD licence.

No account needed
Drop a SLDPRT file.sldprt · up to 200 MB

On our servers. No account: deleted within 24 hours. Signed in: kept until you delete them. Never shared or used for training.

ResultTessellated

The solid in the SLDPRT file is triangulated to produce the 3MF output. Multibody parts keep their bodies separate, with their names.

HowThree steps
  1. Drop your .sldprt file above — up to 200 MB without an account.
  2. 3MF is already selected as the output.
  3. Download the .3mf. Without an account, files are deleted within 24 hours; signed in, they are kept until you delete them.
FormatsWhat you are holding

SOLIDWORKS part file (.sldprt)

A SLDPRT file is a single SOLIDWORKS part: the exact solid — true planes, cylinders and splines — plus its feature history, sketches, material and custom properties. It is proprietary, so nothing else on your machine may open it. Assemblies are SLDASM files. One SLDPRT can hold several bodies, and those should stay separate when converting.

You were sent a SLDPRT, do not have SOLIDWORKS, and need the geometry in something your CAD system, slicer or mesher opens.

3D Manufacturing Format file (.3mf)

3MF was designed to replace STL for 3D printing. It records units, colour and material, keeps multiple objects separate, and is compressed. Bambu Studio, PrusaSlicer, Cura and Windows all read it. The shape is still a triangle mesh.

You are printing and want units, colour and part structure to survive the handover.

Questions7 answered
Is the SLDPRT to 3MF converter free?
Yes. 5 conversions a day with no account and no card. A free account raises the limit and adds 25 credits.
Do I need SOLIDWORKS to convert a SLDPRT file?
No. The file opens and converts in the browser with nothing installed and no CAD licence.
How accurate is the 3MF mesh?
The part opens and comes back as a 3MF mesh, with nothing installed. The solid in the SLDPRT file is triangulated to produce the 3MF output. Multibody parts keep their bodies separate, with their names.
What happens to a multibody part?
Bodies stay separate and keep their names.
How big a file can I convert?
To a mesh format like STL: 300 MB with a free account, 200 MB without one. To STEP, Parasolid or SLDPRT: 140 MB, because rebuilding a solid takes about twice the memory of writing a mesh. Maker and Studio convert up to 830 MB and 380 MB — a large conversion on a paid plan gets the server to itself.
Is it safe to upload my SLDPRT file?
Files travel encrypted and are processed by machine on our own servers — no third parties, no ads or trackers, no AI training.
Is my SLDPRT file deleted after converting?
Without an account, the upload and the result are deleted within 24 hours. With an account, both stay in your files until you delete them; deleted files leave our servers within 24 hours.
Beyond convertingSame file, four workspaces

Keep the part open: fill it with a lattice, check it with FEA, texture a surface, or slice it into cut-ready sheets. These workspaces are in early access — create an account, then apply from inside the app.

Create free account See pricing

ReadWhy this works the way it does
AlsoOther ways in
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Going the other way? Convert 3MF to SLDPRT.

Need it in an older SolidWorks? Save a part for an older release.

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