1. Add the duplex printer first
2. edit /private/etc/cups/ppd/hp8150.ppd
3. Search “Duplex None” and replace the fragment from
*Duplex None/Off (1-Sided): ” <</Duplex false>> setpagedevice”
To
*Duplex None/Off (1-Sided): ” <</Duplex true /Tumble false>> setpagedevice”
