After you are finished with your design, using Move/Copy, Align or Arrange commands, rearrange the small parts you wish to create a sinterbox around so that they are close to each other.

Activate the Sinterbox feature within the DESIGN workspace, SOLID Tab, CREATE Panel. Select one or more Solid bodies as input geometry for the creation of the sinterbox.

The Cage Thickness and Bar Width fields have a default value of 2 mm and 4 mm respectively but can be edited manually.

The Bar Spacing value will be automatically calculated and will update every time you select a new solid body intelligently based on the smallest part selected.

You can uncheck the Automatic Bar Spacing checkbox and enter a manual value for Bar Spacing if desired. Upon selecting the first input body, you will get an in-canvas preview of the sinterbox with all the bars while the Preview checkbox is checked.

If you uncheck the Preview checkbox, the sinterbox preview will not display the bars.

The offset values have a default value of 3 mm, which controls the gap between the outbox of the selected geometry and the sinterbox in all 6 directions (+/- X,Y,Z). You can edit the Offset Values to any positive value. 

When checked, the Move Bodies to New Component checkbox removes the input bodies from their original component and includes them in the new component created by this feature.

Upon clicking OK you will get a new component in the BROWSER named Sinterbox with one or more bodies depending on whether or not you checked the Move Bodies to New Component.

Install:
The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. Or, simply double-click the downloaded installer to install the app/plugin.

Uninstall:
You can unload the add-in without uninstalling it by clicking the "Stop" button when the add-in is selected in the list box on the "Add-Ins" tab of the "Scripts and Add-Ins" dialog.
Unchecking "Run on Startup" causes the add-in not to be loaded in future sessions of Autodesk® Fusion 360™.
To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button.
Or, you can uninstall it from 'Control Panel/Programs and Features' (Windows 7/8.1/10), just as you would uninstall any other application from your system.

Only Solid Bodies are accepted as Input Bodies. Mesh bodies are currently not supported in this app. 

The Sinterbox feature is only available in the DESIGN workspace. It is not available in the MANUFACTURE workspace while editing a Manufacturing model. It is also not available in the SIMULATION workspace in the SIMPLIFY SOLID tab.