Espresso Machines OPV set to 9 bar — before or after the puck? 1 reply beginner mods Lena R. 6 hours, 7 minutes ago Original post OPV set to 9 bar — before or after the puck? Sharing what has worked and what has not — curious what everyone else does. Mara K.Permalink to reply 6 hours, 7 minutes agoGood question — following this one.