Autodesk AutoCAD Plant 3D 2026.1

Problems Reported Through the Customer Error Reporting Utility
As a result of the detailed information that we received from customers who used the Customer Error Reporting Utility, we were able to identify and fix several defects including the following:
Equipment
AutoCAD Plant 3D no longer crashes when adding a new leg shape to an equipment.

General Update Content
The following defects have been fixed:

Collaboration Workflow
An open circuit error no longer occurs when choosing an Autodesk Docs project after switching from all accounts and all projects options.
An error while copying content to a stream no longer displays when opening a specific project.
Ortho creation and Iso creation always download the latest version of 3D models to create drawings.
Project Management
Orphaned OPC data are now removed from Data Manager.
Exported Excel files from Data Manager now have protected cells, consistent with the AutoCAD Plant 3D 2023 release.
Piping
Property editing now works for all ports in property palettes.
Pipe support size no longer resets during spec update in 3D models when resizing connected pipe, substituting pipe support, or moving it to another pipe of different size.
Status property remains unchanged when resizing the pipe or substituting a pipe support.
Bolt sets position correctly when flange wafer-type valves are placed without gaskets.
Orthographics
Valve geometry is now fully visible in ortho views for specific projects.
Specific flanges correctly display in ortho drawings for certain 3D models. These flanges also correctly display in output drawings after using the EXPORTTOAUTOCAD command.
Isometrics
The precision of the weight property in the Iso BOM (Bill of Materials) table can be adjusted using the Isoconfig.xml file.
The Iso message box expands properly to accommodate the enclosed text in Iso annotations.
Iso creation now succeeds when adding a pipe support to pipelines with small tolerance.
The line numbers box is resized accordingly when resizing the Create Production Iso dialog box or the Create Quick Iso dialog box.
Removed line numbers no longer displays when choosing “Showing line numbers in current drawing only” option in both Create Production Iso and Create Quick Iso dialog boxes.
Improved performance when filtering line numbers in both Create Production Iso and Create Quick Iso dialog boxes.
Spec Editor
A duplicate spec no longer opens when accessing the same active spec.
After removing parts from the spec in the spec sheet or the Catalog Browser, the selection automatically moves to the next item.
Size parameters no longer display when selecting multiple block-based parts in a spec.
Property column width is now resizable in Spec and Catalog tabs.
Changes saved from property editor dialog box are updated in the main interface for both Spec and Catalog tabs.
Save changes dialog box no longer displays when saving changes in the Spec Property Editor dialog box.
The property editor dialog box now allows typing decimal values less than 1.
New custom properties display in main interface when saved in the property editor dialog box.
Warning dialog box no longer appears when saving the Iso Symbol SKEY property changes in the property editor dialog box.
The valve operator no longer displays when creating a new valve with the pipe component set to valve.
Valve operator long descriptions display correctly when editing properties in the Part Size tab.
Default valve operators display correctly in the Override Valve Operator dialog box.
Rounding functions correctly when switching from imperial to metric units.
Duplicated OLET no longer display in Iso Symbol Type drop-down list.
The ContentGeometryParamDefinition property no longer displays as changed for a spec when importing back excel spreadsheet without any changes.
Undefined size is no longer saved to the catalog when switching to another catalog.
Part preview and size parameters now display when selecting multiple sizes in Catalog Browser.
Filter and search results are maintained in Catalog Browser when changing any values in the main interface in Catalog tab.
The plus (+) and minus (-) shortcuts now move properties correctly in AutoPLANT to Plant 3D Mapping dialog box.
Specific specs correctly display in both Spec Editor and Spec Viewer.
Report Creator
Report creator migration works for specific legacy RCF files.
Interoperability
Decimal separator now honors the Windows settings when opening drawings in Navisworks.
Specific objects now display in the correct layers in Navisworks, when setting the PLANTIGNORENESTEDLAYER system variable to 1.

AutoCAD_Plant_3D_2026.1_Update.exe
Object_Enabler_for_AutoCAD_Plant_3D_2026_Navisworks.exe