A beverage preparation machine comprising: - an extraction unit having a capsule chamber and an outlet and an actuator, the chamber being configured for housing an ingredient capsule while extracted to form a beverage, the outlet being configured for dispensing the formed beverage, and the actuator being configured to: - open the capsule chamber for removing said capsule form the chamber after extraction and optionally inserting said capsule into the chamber before extraction; - close the capsule chamber for extracting said capsule in the chamber; and - a service unit located under the extraction unit and forming a receptacle having a collection cavity with an opening for collecting via said opening said capsule and residual liquid projections from said chamber when opened to remove said capsule, the service unit having an upright wall defining an outside face that is accessible from outside said machine, the upright wall delimiting at least one through-passage for favouring air circulation from inside the cavity to outside said machine, the through-passage extending from the cavity to the outside of said machine; and - a foot for being placed on an external horizontal placement surface so that said machine extends upwardly above the foot in an operative position for delivering said beverage via the outlet, characterised in that, when said machine is in its operative position on said external horizontal placement surface, said at least one through-passage has in vertical cross-section along the through-passage: - a medial axis generally sloping upwards along the through-passage from the cavity to the outside of said machine; and/or - a bottom delimitation line with a highest end and a top delimitation line with a lowest end, the highest end and the lowest end defining a straight axis sloping from the cavity to the outside of said machine: - upwards by an angle (α) relative to said external horizontal placement surface of less than 90 deg, such as less than 60 deg, e.g less than 45 deg; or - downwards by an angle (α) relative to said external horizontal placement surface of less than 50 deg, such as less than 45 deg e.g. less than 30 deg, whereby said residual liquid projecting from the chamber, when opened to remove said capsule, is inhibited from projecting through said at least one through-passage to the outside of said machine via the upright wall. - an extraction unit having a capsule chamber and an outlet and an actuator, the chamber being configured for housing an ingredient capsule while extracted to form a beverage, the outlet being configured for dispensing the formed beverage, and the actuator being configured to: - open the capsule chamber for removing said capsule form the chamber after extraction and optionally inserting said capsule into the chamber before extraction; - close the capsule chamber for extracting said capsule in the chamber; and - open the capsule chamber for removing said capsule form the chamber after extraction and optionally inserting said capsule into the chamber before extraction; - close the capsule chamber for extracting said capsule in the chamber; and - a service unit located under the extraction unit and forming a receptacle having a collection cavity with an opening for collecting via said opening said capsule and residual liquid projections from said chamber when opened to remove said capsule, the service unit having an upright wall defining an outside face that is accessible from outside said machine, the upright wall delimiting at least one through-passage for favouring air circulation from inside the cavity to outside said machine, the through-passage extending from the cavity to the outside of said machine; and - a foot for being placed on an external horizontal placement surface so that said machine extends upwardly above the foot in an operative position for delivering said beverage via the outlet, - a medial axis generally sloping upwards along the through-passage from the cavity to the outside of said machine; and/or - a bottom delimitation line with a highest end and a top delimitation line with a lowest end, the highest end and the lowest end defining a straight axis sloping from the cavity to the outside of said machine: - upwards by an angle (α) relative to said external horizontal placement surface of less than 90 deg, such as less than 60 deg, e.g less than 45 deg; or - downwards by an angle (α) relative to said external horizontal placement surface of less than 50 deg, such as less than 45 deg e.g. less than 30 deg, - upwards by an angle (α) relative to said external horizontal placement surface of less than 90 deg, such as less than 60 deg, e.g less than 45 deg; or - downwards by an angle (α) relative to said external horizontal placement surface of less than 50 deg, such as less than 45 deg e.g. less than 30 deg,