You are using macOS 10.12.6, not 12.8.6.
Reset your printer:
- Turn on your connected printer.
- System Preferences : Printers & Scanners
- Right-click on your specific printer in the Printers panel, and select Reset Printing System...
- A sheet will descend, and you will click Reset button
- A dialog will appear and you enter your login password
- The Printers display area will now be blank.
- Do not change the Default Printer: Last Printer Used setting
- Click the + symbol to add a new printer
- A panel will pop with your HP LaserJet 3030 device. Select your device.
- The emtpy fields of this panel will now populate, and it may set the Use: selector to AirPrint.
- Click this AirPrint selection, and the next item on that menu will likely be your HP LaserJet 3030 printer driver. Select it.
- Click Add.
- You may see a drop down sheet with some of your printers options displayed. If so, configure appropriately, and then click OK.
- Your Printers entry now should show your HP LaserJet 3030 with a green idle indicator.
- Print something.
I no longer own an HP printer, and do not use either of the following solutions.
The HP Printer Drivers v5.0 for OS X (released Aug 2016) shows this LaserJet model is supported, but only for Printing. There is no newer macOS HP driver for this device. Print, scan, and Fax are supported by the HP Linux Imaging and Printing for several distros (including Ubuntu 17.04).
There is macOS Sierra Gutenprint support for the HP LaserJet 3030 mentioned in the 5.2.13-pre1.dmg release, but no detail on the specific functions of the device that are supported. Download page. Recommend the 5.2.12 release until 5.2.13 is out of pre-release status, or 5.3 (development in progress) final release appear for macOS.