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AutoCAD Based 3D Modeling (Ribbon/Toolbar/Location)
Description:
When raising to 3D, the drawing hangs. On the progress bar at the bottom, it may be stuck at, "Creating entry for mains database"

If you turn off the Show Fittings in Model option found in the 3D Modeling Settings window (3MO command), it likely will create a model.

The only option is to End Task AutoCAD to stop the process.
Very likely an "awkward" fitting and probably involves a green pipe / armover pipe in the SPRKDAT4 layer.

When the sprinkler was moved away from the green outlet, the 3D model worked with "show fittings" turned on.