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Windows: "HP LaserJet Pro M402-M403 n-dn PCL 6"

Mac: The closest Apple listing I saw within the OS was for an M400 (for the whole series?), so choose that. Duplex worked fine.

You can get the correct driver via Windows's printer driver's  listing, which you get when you are installing a printer. However, you must select "Update" in both Win10 and Win 7.

• Worth knowing the name so you can actually find it in the very long list of drivers, in one of the 3 "HP" sections. Ridiculous.
• Running the "Update" takes many minutes. Again, ridiculous.

There's a presumably identical driver which ends in "PCL-6" (dash, not a space).

Use HP's, NOT MS's driver

MS's universal driver  (via "add a printer" interface, LaserJet P2050) will often lead to the driver forgetting the printer can duplex.

• Very aggravating so avoid that "easy" way to get the driver!!
• Non-Chemistry IT staff: Download from HP, via the web. Universal:
  
  • http://support.hp.com/us-en/drivers/selfservice/HP-LaserJet-P2000-Printer-series/3662052/model/3662058
• (Chemistry IT staff: You can also get it from our file share.)