Hi Franziska,
HP has not yet released Driver software for your MAC LION however there is a solution for this.
In order to print 2 sided ( duplex printing ) you need to install drivers and it is possible by doing Apple Update.
The link below will give you more details information of how to install the drivers.
MAC LION Driver UpdateOnce you have done the Update and installed the drivers, you will find the Printer name in Printers list.
Click on Printer Utility and under Layout you will find options to choose 2 sided printing
Regards,
Sean
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