Updated 2026-10-17
To convert SLDASM to STL, drop the .sldasm into the converter below and download one .stl with every shown component in its assembled position, in millimetres. Hidden and suppressed components are left out. Assemblies of up to 5 parts need no account. If you are printing the parts separately, convert each SLDPRT on its own instead.
5 conversions a day with no account. No card, no install, no CAD licence.
On our servers. No account: deleted within 24 hours. Signed in: kept until you delete them. Never shared or used for training.
The solid in the SLDASM file is triangulated to produce the STL output. Assemblies convert whole, and components keep their names.
A SLDASM records which parts make a product, where each one sits and the mates that hold them. An STL records triangles. Converting gives you the assembled shape as a single mesh: every visible component placed where the assembly put it, all in one file.
Everything that is not shape stays behind: mates, part names, the feature trees, configurations, colours and the unit. The STL is in millimetres, so choose millimetres if your software asks.
One STL of a whole assembly is right for a viewer, a render or a fit check, and for printing a model that really is one piece. It is wrong for printing a working mechanism: components that touch in the assembly become one mesh, and a slicer prints what it is given. For separate prints, convert the part files one at a time.
Assemblies saved before SOLIDWORKS 2015 convert to STL as well, as long as the file says where every part sits; if it does not, the converter says so rather than piling the parts at the origin. An assembly sent without its part files may hold no geometry at all, and the converter tells you.
A SLDASM file is a SOLIDWORKS assembly: parts positioned by the mates that constrain them. Sent with its SLDPRT files, the whole product converts as one and component names are kept. An assembly that stores its components’ shapes converts on its own too, every component placed where it sits — as a mesh, or as a solid whose surfaces are rebuilt from those stored shapes.
Someone sent you a whole product and you need it in a neutral format your CAD system, renderer or printer takes.
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.
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.
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