HP Designjet Z3100 Photo Printer series - Manual (Page 125)

Under Mac OS, select Job Accounting and click on the Look Up button.
Printer statistics with the Embedded Web Server
1. Access the Embedded Web Server, see Access the Embedded Web Server on page 20 .
2. Go to the Main tab.
3. Select History > Accounting.
ENWW Check ink and paper usage for a job 115
Printer usage