Api

SolidWorks automation: four levels and where drawing creation fits SolidWorks automation exists on a spectrum. Understanding where each approach sits — what it costs to implement, what it can do, and where it breaks — saves engineers from picking a tool that is the wrong shape for the job. Level 1 — Record macro. SolidWorks’ built-in macro recorder captures UI actions as VBA code. You click through a sequence of steps, stop the recorder, and have a macro that replays those steps. This works for simple, identical operations: changing a document property across ten files, printing a drawing with fixed settings. It breaks immediately when the input varies — different part names, different view orientations, any conditional logic. The recorder also silently drops interactions with dialog boxes, property manager panels, and anything that requires polling SolidWorks for a return value. The SolidWorks macro recorder limitations guide documents exactly what it misses. ...

Two posts in the last week on r/SolidWorks surface the same class of bug: DXFs that look fine in SolidWorks land corrupted downstream. One user watched bend lines lean off-axis on a small flange until they dropped the end point merging tolerance from 1 to 0.1. Another spent a week re-ticking the entity checkboxes on every export because SolidWorks does not remember them. Both problems come from defaults that SolidWorks ships and almost nobody documents — buried in a bitmask you only see if you touch the API. ...

You just built a SolidWorks add-in. Before it can run, you need to register it as a COM server with regasm.exe, write registry keys under HKEY_LOCAL_MACHINE, and make sure your class has [ComVisible(true)] and a [Guid] attribute. You need admin privileges. You’re locked to .NET Framework 4.x. And if the registration goes wrong, you get a cryptic swRegistrationError and nothing loads. Meanwhile, your colleague building an Inventor add-in drops a .addin XML file into a folder, points it at a .NET 8 assembly, and it just works. No regasm, no registry, no admin rights. ...

There’s a recurring post format in the SolidWorks community that breaks CAD automation into levels: macros, parametric design, API integration, configurators. The comments are always the same — experienced engineers arguing about which level their team is actually at, and why Level 3 is the sweet spot that most teams never reach. They’re right. And understanding why most teams plateau matters if you’re trying to decide where to invest automation effort. ...