Stratasys J850 Manual page 31

The printer interface screen changes when you send a print job to the printer,
if the printer is on line:
• The mode changes from Pre-print to Printing.
• The specific activity being performed is shown in the "current activity"
field.
• Current job-printing information is displayed.
• The printing progress bar is displayed.
• The Stop and Pause buttons are enabled.
When the weight of a cartridge drops below 100 grams, the display of the
material level in the printer interface is red.