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This page is a translated version of the page Assembly4 Workbench and the translation is 18% complete.
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Assembly4 workbench icon.svg

The FreeCAD Assembly4 External Workbench Icon


Assembly4 is an external workbench that is used to perform assembly of different bodies contained in a single file or in multiple documents. It was created in the v0.19 development cycle to take advantage of Assembly3's new features.

It was developed with the idea that a true constraint solver was not needed, and instead the expression engine was enough to establish relationships between different bodies.



Assembly4 was developed from the new tools created for Assembly3, in particular, the App Link object and the improved expression engine.

Assembly4 was inspired by A2p workbench.svg A2plus and Assembly3 but it is not compatible with them. If you have older models made in those two workbenches, you should use those workbenches to open your models only.