Device for filling cartridges of e-cigarettes with a liquid, the device comprising: - a supply conduit connected to a source of liquid, - a plunger pump having an inlet which is connected to the supply conduit, and an outlet, the plunger pump being configured to pump a volume of liquid during a filling stroke, - a discharge conduit connected to the outlet of the plunger pump, - a discharge nozzle connected to a downstream end of the discharge conduit, the discharge nozzle being configured to inject the volume of liquid into the cartridge, - an expansion device which is connected to the discharge conduit, the expansion device being configured for increasing a volume in the discharge conduit between the outlet of the plunger pump and the discharge nozzle at the end of the filling stroke for preventing any drip to occur from the discharge nozzle after the filling stroke of the plunger pump has ended, wherein; -- the expansion device comprises a movable part which is configured to make a reciprocating movement, -- the movable part makes a compression stroke and an expansion stroke, wherein during the compression stroke of the movable part the volume of the discharge conduit is decreased and wherein during an expansion stroke of the movable part the volume of the discharge conduit is increased, -- the compression stroke of the movable part takes place during the filling stroke of the plunger pump and wherein the expansion stroke of the movable part takes place during the return stroke of the plunger pump, and -- the plunger of the plunger pump and the movable part are driven by a single cam which is configured to run along a cam track, wherein the cam track drives both the plunger pump and the expansion device via the single cam, wherein the driving of the expansion device by the cam takes place directly or takes place indirectly via an intermediate driving element. - a supply conduit connected to a source of liquid, - a plunger pump having an inlet which is connected to the supply conduit, and an outlet, the plunger pump being configured to pump a volume of liquid during a filling stroke, - a discharge conduit connected to the outlet of the plunger pump, - a discharge nozzle connected to a downstream end of the discharge conduit, the discharge nozzle being configured to inject the volume of liquid into the cartridge, - an expansion device which is connected to the discharge conduit, the expansion device being configured for increasing a volume in the discharge conduit between the outlet of the plunger pump and the discharge nozzle at the end of the filling stroke for preventing any drip to occur from the discharge nozzle after the filling stroke of the plunger pump has ended, wherein; -- the expansion device comprises a movable part which is configured to make a reciprocating movement, -- the movable part makes a compression stroke and an expansion stroke, wherein during the compression stroke of the movable part the volume of the discharge conduit is decreased and wherein during an expansion stroke of the movable part the volume of the discharge conduit is increased, -- the compression stroke of the movable part takes place during the filling stroke of the plunger pump and wherein the expansion stroke of the movable part takes place during the return stroke of the plunger pump, and -- the plunger of the plunger pump and the movable part are driven by a single cam which is configured to run along a cam track, wherein the cam track drives both the plunger pump and the expansion device via the single cam, wherein the driving of the expansion device by the cam takes place directly or takes place indirectly via an intermediate driving element. -- the expansion device comprises a movable part which is configured to make a reciprocating movement, -- the movable part makes a compression stroke and an expansion stroke, wherein during the compression stroke of the movable part the volume of the discharge conduit is decreased and wherein during an expansion stroke of the movable part the volume of the discharge conduit is increased, -- the compression stroke of the movable part takes place during the filling stroke of the plunger pump and wherein the expansion stroke of the movable part takes place during the return stroke of the plunger pump, and -- the plunger of the plunger pump and the movable part are driven by a single cam which is configured to run along a cam track, wherein the cam track drives both the plunger pump and the expansion device via the single cam, wherein the driving of the expansion device by the cam takes place directly or takes place indirectly via an intermediate driving element.