Convert 3DM
to Parasolid.

Updated 2026-10-06

To convert 3DM to Parasolid, drop the Rhino .3dm into the converter below and download an .x_t for SOLIDWORKS, Solid Edge or NX. Closed NURBS polysurfaces are translated exactly, so the faces Rhino drew are the faces the solid has. No Rhino licence is needed, and up to 2 solid conversions a day need no account. In Rhino itself, exporting STEP is the usual alternative.

2 solid-geometry conversions a day with no account. No card, no install.

No account needed
Drop a 3DM file.3dm · up to 200 MB
Several bodies

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

ResultExact where NURBS

Trimmed NURBS breps and lightweight extrusions become true surfaces in the Parasolid output, with nothing tessellated, in millimetres whatever the model's unit. Mesh and SubD objects beside them come too, rebuilt as true surfaces where they fit and facets where they do not. Hidden objects are left out, and the converter says how many.

A 3DM that is all mesh has its surfaces recovered from the triangles where they fit and facets where they do not, and the conversion says which of the two it gave.

Changes3DM → Parasolid

What changes between 3DM and Parasolid

Rhino and Parasolid both describe shape with exact surfaces, so a trimmed NURBS polysurface becomes a Parasolid solid with the same faces, curves and dimensions, with nothing tessellated.

The difference is discipline. Rhino is happy with open surfaces, stray curves, meshes and solids side by side on layers. A Parasolid transmit file is a solid body. Closed polysurfaces convert cleanly; open ones are what most often cause trouble, so run Join and check for naked edges in Rhino first. A 3DM that is all mesh is handled like an STL: planes, cylinders and other simple surfaces are recognised and rebuilt as true faces.

Layers, colours, curves, annotations and Rhino's own history do not travel; the .x_t is geometry only. If the destination is a CAD system other than SOLIDWORKS, Solid Edge or NX, convert to STEP instead.

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

Rhinoceros 3D model file (.3dm)

A 3DM file is a Rhino model. Rhino is a NURBS modeller, dominant in industrial design, jewellery, marine and architecture. A 3DM can mix exact breps, surfaces, meshes and curves on layers; polysurfaces and extrusions convert exactly, and mesh objects come along: as meshes in a mesh format, rebuilt as true surfaces in a solid one.

A designer works in Rhino and engineering or manufacturing needs the shape in a format their system reads.

Parasolid transmit file (.x_t / .x_b)

Parasolid is the modelling kernel under SOLIDWORKS, Solid Edge and NX, and a transmit file is its exact solid geometry. Between systems that share the kernel it often survives better than a neutral format. .x_t is text, .x_b is binary; both hold the same solid.

Someone in a Siemens or SOLIDWORKS shop sent you an .x_t and nothing you have opens it.

Questions11 answered
Do I need Rhino to convert a 3DM to x_t?
No. The .3dm is read on our servers; nothing is installed and no Rhino licence is needed.
Do I get an .x_t or an .x_b?
An .x_t, the text encoding, which is what SOLIDWORKS, Solid Edge and NX users usually exchange. The binary .x_b holds the same solid at the same precision; the encoding makes no difference to the geometry.
Why did part of my model not come through as a solid?
Open polysurfaces cannot become a closed solid. Join them in Rhino, check that no naked edges are left, and convert again.
Should I export STEP from Rhino instead?
If you have Rhino, STEP from Rhino is a fine route for any CAD system. Use this page when you do not have Rhino, or when someone asked for Parasolid by name.
Is the 3DM to Parasolid converter free?
Yes. 2 solid-geometry conversions a day with no account, of 5 in total. A free account converts 4 solid files a day and adds 25 credits. No card.
Do I need Rhino installed?
No. The 3DM file is read in the browser with nothing installed and no Rhino licence.
Does anything change in the geometry?
NURBS bodies in the Rhino file are translated to Parasolid exactly. Trimmed NURBS breps and lightweight extrusions become true surfaces in the Parasolid output, with nothing tessellated, in millimetres whatever the model's unit. Mesh and SubD objects beside them come too, rebuilt as true surfaces where they fit and facets where they do not. Hidden objects are left out, and the converter says how many. A 3DM that is all mesh has its surfaces recovered from the triangles where they fit and facets where they do not, and the conversion says which of the two it gave.
Will the Parasolid file open in Fusion 360, Inventor or Onshape?
Yes. Parasolid is read directly by Fusion 360, Inventor, Onshape, SOLIDWORKS, Creo, NX and FreeCAD. It arrives as a solid body you can measure, mate and cut.
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 3DM 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 3DM 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

AlsoOther ways in
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Going the other way? Convert Parasolid to 3DM.

Rhinoceros® and Rhino® are registered trademarks of Robert McNeel & Associates. MeshWeave is an independent tool and is not affiliated with, endorsed by, or sponsored by Robert McNeel & Associates. Parasolid® is a registered trademark of Siemens. MeshWeave is an independent tool and is not affiliated with, endorsed by, or sponsored by Siemens.