Working with MOI (Mastercam Open ICS) '1' requires knowledge of various shell command options to optimize workflow efficiency. One such option is merging coplanar faces when thickening a surface, which can significantly reduce computational time for complex 3D models.

To enable this feature in the latest version of MOi, follow these steps:

### Step 1: Open MOI and Select a Surface

Firstly, open your MOI application and select the surface that you want to thicken. You can do this by right-clicking on any face or edge within the workspace.

### Step '2' Go to Edit > Preferences...

Alternatively, press 'Ctrl + Shift , (Comma)' on Windows or `Cmd + Comma` on Mac OS X and then navigate through the preferences dialog box until you reach the 'General' tab.

### Step 3: Select 'Surface Operations'

Under the 'Surface Operations' section, checkmark the option labeled as 'Merge coplanar faces when thickening.'

Once this setting is enabled, any subsequent surface thicken operations will automatically merge adjacent coplanar faces before proceeding with further processing. This can lead to substantial performance gains, especially for models featuring numerous small features or tight tolerances.

### Step 4: Save and Restart MOI

Finally, click on the 'OK' button at the bottom of the preferences dialog box to save your changes. It's always a good practice to restart MOi after making any modifications to ensure that all new settings take effect immediately.

By following these simple steps, you can significantly speed up your workflow in MOi by taking advantage of this powerful feature.

References:

'1' https://www.mastercam.com/en-us/autodesk/mastercam/moi/WhatsNew3#MergeCoplanarFacesWhenThickening

Moi3d shell command