Convert Parasolid
to STL.

Updated 2026-10-06

To convert Parasolid to STL, drop the .x_t or .x_b file into the converter below and download the .stl, ready for a slicer. The exact surfaces are triangulated to within 0.02 mm, with edges sampled first so holes and chamfers stay crisp, and the file is written in millimetres. 5 conversions a day are free with no account, and nothing is installed.

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

No account needed
Drop a Parasolid file.x_t / .x_b · 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

Edges are sampled first, so chamfers, fillets and holes come through crisp. Default tolerance: 0.02 mm chord deviation, 0.1 rad angle — fine enough to print directly.

Tessellation is one-way — keep the Parasolid file if you will edit the shape later.

ChangesParasolid → STL

What changes between Parasolid and STL

This is the direction where the geometry really does change. A Parasolid file holds exact surfaces: a cylinder is a cylinder, with a radius. STL holds only flat triangles, so every curved face becomes a fan of facets that approximates it. The approximation here is tight. No point on a facet sits more than 0.02 mm from the true surface, and neighbouring facets on a curve turn by no more than about 6 degrees, which is finer than a desktop printer resolves.

Everything that is not shape is dropped. STL records no unit, colour, body name or history; this one is written in millimetres, so choose millimetres if your slicer asks. Several bodies arrive together in the one STL.

The step is one-way. Keep the .x_t or .x_b if the part will be edited or machined: an STL can only estimate the radius of a hole, never give it back.

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

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.

STL file (stereolithography) (.stl)

STL is the lingua franca of 3D printing: a flat list of triangles. No unit, colour, material or history — a cylinder is a fan of flat strips. The missing unit is the classic cause of scale accidents. Every slicer and mesh tool reads it.

You are printing, meshing or sending to a bureau — where triangles are what is wanted.

Questions11 answered
How do I convert x_t to STL?
Drop the .x_t on this page, where STL is already selected, and download the result. An .x_b converts the same way.
Can my slicer open an .x_t directly?
Not usually. PrusaSlicer, Bambu Studio, Cura and most other slicers read STL, 3MF or OBJ, and some read STEP, but none of the common ones read Parasolid. Converting to STL or 3MF is the normal route.
Should I use STL or 3MF for printing?
3MF if your slicer takes it: it records units and keeps separate objects apart, so the part cannot arrive at the wrong scale. STL when a print service or older tool asks for it.
What if the Parasolid file will not convert?
A few surface types, variable-radius blends among them, are not rebuilt yet. When the converter meets one it stops and names it rather than writing a damaged file, and the attempt does not count against your free conversions. Ask the sender for a STEP export instead; every Parasolid-based system writes one.
Is the Parasolid to STL converter free?
Yes. 5 conversions a day with no account and no card. A free account raises the limit and adds 25 credits.
How accurate is the STL mesh?
The exact surfaces are triangulated into a STL mesh. Edges are sampled first, so chamfers, fillets and holes come through crisp. Default tolerance: 0.02 mm chord deviation, 0.1 rad angle — fine enough to print directly. Tessellation is one-way — keep the Parasolid file if you will edit the shape later.
Will the STL file be the right size?
It is written in millimetres. STL records no unit, so choose millimetres if your slicer asks. 3MF records units in the file.
Does it read both .x_t and .x_b?
Yes. Text (.x_t) and binary (.x_b) hold the same solid, and both convert here.
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 Parasolid 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 Parasolid 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 STL to Parasolid.

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