Film-dispensing cassette for waste-disposal systems

A film-dispensing cassette comprising an annular cassette body having a top end and a bottom end, the annular cassette body having a central opening, the central opening having a central axis, the annular cassette body defining a receptacle extending around the central opening, the receptacle having an annular opening at the top end of the annular cassette body, the receptacle having a registration wall extending along a periphery of the central opening, the registration wall having a downwardly facing surface having a relief defining a pattern of protrusions and recesses, the protrusions having respective crest lines extending obliquely relative to the central axis, the crest lines lying in a virtual frustum, a free annular volume being delimited by the virtual frustum, a virtual cylinder projecting from the periphery of the central opening, and an axial plane at a bottom of the cassette body.