Thermoforming device, mold assembly, mold, and method

A thermoforming device, comprising:

• a first mold comprising a first mold body and a forming cavity arranged in said first mold body;
• a second mold comprising a second mold body, a first pre-stretcher, and a calibration element, wherein the first pre-stretcher and the calibration element are at least partially and moveably arranged in the second mold body;
• wherein the first and second mold can be moved relative to each other for clamping a plastic foil there between;
• wherein the calibration element is configured to locally clamp the plastic foil in between the calibration element and a wall and/or bottom of the forming cavity;
• wherein the thermoforming device further comprises a second pre-stretcher that is at least partially and moveably arranged in the second mold body, and wherein a movement relative to the second mold body and towards the same forming cavity of at least one of the first pre-stretcher, the second pre-stretcher, and the calibration element, can be individually controlled, and wherein the second pre-stretcher at least partially surrounds the first pre-stretcher and the calibration element.