Opening device for the opening of a monomer liquid container (1) comprising a positioning aid (6) for positioning of the monomer liquid container (1), an opening facility (8) for the opening of the monomer liquid container (1), the opening facility (8) being mobile with respect to the positioning aid (6) and/or the positioning aid (6) being mobile with respect to the opening facility (8), at least one elastically deformable energy-storing element (9) for storage of elastic energy, whereby a motion of the opening facility (8) and/or a motion of the positioning aid (6) can be driven by the elastic energy of the at least one elastically deformable energy-storing element (9).
