CAD customisation in one paragraph
CAD customisation means extending a CAD application such as AutoCAD, Inventor, Revit, SolidWorks, PTC Creo, CATIA or Siemens NX with your own commands, tools, interfaces and rules. It uses the software's official programming interfaces (APIs) to add features the vendor never shipped, because those features are specific to your products, your standards and your customers.
What customisation looks like in practice
- Custom commands that perform multi-step tasks in one click, such as inserting a standard assembly or numbering all balloons.
- Add-ins and plugins with their own ribbon tabs, dialogs and palettes.
- Design rules that check models and drawings against your company standards.
- Parametric generators that build parts or assemblies from a few inputs.
- Integrations that push BOMs and properties to ERP or PLM systems.
- Custom file outputs such as DXF for laser cutting, PDFs with stamps or reports in Excel.
Why engineering companies need it
1. Engineers spend too much time on repetitive work
In most design offices, a large share of CAD time goes on tasks that follow the same rules every time: drawing frames, title blocks, standard parts, BOM tables, file naming and exports. These tasks are perfect for software.
2. Standards are hard to enforce manually
Layer names, dimension styles, material properties and part numbering drift over time when they depend on memory. Custom tools apply the standard automatically and check it before release.
3. Your products have their own logic
A conveyor manufacturer, a switchgear builder and an HVAC contractor all design very differently. Generic CAD cannot know your product rules, but a custom tool can.
4. Data has to leave the CAD system
Purchasing, production and service all depend on data that starts in CAD. Customisation connects that data to the rest of the business without re-typing.
Typical examples by industry
| Industry | Customisation example |
|---|---|
| Machinery | Configurator that builds a machine variant and its drawings from a sales order |
| Sheet metal | Automatic flat patterns, DXF export and nesting-ready file names |
| Electrical panels | Terminal and wire numbering, panel layout and reports in AutoCAD Electrical |
| MEP / BIM | Revit tools for sizing, tagging, sheet creation and clash-ready models |
| Aerospace | Model validation and metadata checks before release to PLM |
How CAD customisation is built
Each CAD platform offers its own APIs: AutoLISP, .NET and ObjectARX for AutoCAD; the Inventor, Revit and Fusion APIs from Autodesk; the SOLIDWORKS API; Creo TOOLKIT and J-Link; CATIA CAA and VBA automation; and NX Open for Siemens NX. A good partner chooses the right interface for the job, not just the one they know best.
Good customisation feels like part of the CAD software. Engineers should not need training to use it, only to notice how much faster they work.
How to get started
- List the ten tasks your engineers repeat most often.
- Estimate the hours per week each one takes.
- Start with one high-value, low-risk tool and measure the time saved.
- Expand into a toolkit once the first tool proves its value.
ENGIMANDI is an official Autodesk Development Partner and builds CAD customisation, integration and automation for AutoCAD, Revit, Inventor, Fusion, SolidWorks, Creo and CATIA.