PowerPoint 2016 allows users to print a presentation in black and white or Grayscale using Setting under Print menu.
Launch PowerPoint presentation, click File menu and select Print from the menu option.
In Print screen, navigate to Settings section and use the Color dropdown to pick Pure Black and White or Grayscale.
Another alternative to print the presentation in Grayscale is by using Printer Properties. Click Pinter Properties in Print screen.
In the Printer Properties screen, click the Advanced button available at the right bottom corner.
Then under Printer Features, you can enable or disable the Print in Grayscale option.