A multi-cavity mould for a thermoforming machine used in the process of high-volume, continuous thermoforming of a plurality of thin-gauge plastic products from a preheated thin-gauge thermoplastic sheet comprising: - an upper tool and a lower tool arranged in a cooperating manner; the lower tool comprising: o a plurality of cavities in which cavity moulds may be placed and o a plurality of base plates from which a plurality of supporting blocks extend perpendicularly over a predetermined total height (a), situated between adjacent cavities, wherein each of said supporting block has a stepped profile comprising a first, a second, a third substantially rectangular shaped zones in a vertical cross section and a substantially isosceles trapezoid shaped fourth zone in a vertical cross section, having a common symmetry axis in a vertical cross section through a plane perpendicular to said base plate, characterized in that - said first zone extends perpendicularly from said base plate over a distance calculated as 17-50% of the total height (a) of said supporting block and the width of the first zone is calculated as 24-60% of the total height (a) of said supporting block; - said second zone extends in continuation of said first zone over a distance calculated as 45-65% of the total height (a) of said supporting block and the width of the second zone is calculated as 7-16% of the total height (a) of said supporting block; - said third zone extends in continuation of said second zone over a distance calculated as 9-12% of the total height (a) of said supporting block and the width of the third zone is calculated as 5-10% of the total height (a) of said supporting block; - said substantially isosceles trapezoid shaped fourth zone extends in continuation of said third zone over a distance calculated as 9-12% of the total height (a) of said supporting block, wherein the fourth zone has a bottom base in contact with and having the same width as the third zone, a top base and two legs of equal length between the top and bottom bases, and the width of the top base of said fourth zone is calculated as 2.5-5% of the total height (a) of said supporting block. - an upper tool and a lower tool arranged in a cooperating manner; the lower tool comprising: o a plurality of cavities in which cavity moulds may be placed and o a plurality of base plates from which a plurality of supporting blocks extend perpendicularly over a predetermined total height (a), situated between adjacent cavities, o a plurality of cavities in which cavity moulds may be placed and o a plurality of base plates from which a plurality of supporting blocks extend perpendicularly over a predetermined total height (a), situated between adjacent cavities, - said first zone extends perpendicularly from said base plate over a distance calculated as 17-50% of the total height (a) of said supporting block and the width of the first zone is calculated as 24-60% of the total height (a) of said supporting block; - said second zone extends in continuation of said first zone over a distance calculated as 45-65% of the total height (a) of said supporting block and the width of the second zone is calculated as 7-16% of the total height (a) of said supporting block; - said third zone extends in continuation of said second zone over a distance calculated as 9-12% of the total height (a) of said supporting block and the width of the third zone is calculated as 5-10% of the total height (a) of said supporting block; - said substantially isosceles trapezoid shaped fourth zone extends in continuation of said third zone over a distance calculated as 9-12% of the total height (a) of said supporting block, wherein the fourth zone has a bottom base in contact with and having the same width as the third zone, a top base and two legs of equal length between the top and bottom bases, and the width of the top base of said fourth zone is calculated as 2.5-5% of the total height (a) of said supporting block.