权利要求：
1. Additive manufacturing device which is set up for the layer-by-layer production of a three-dimensional product (21) from a liquid raw material (22) by means of an immersion bath stereolithography process, the additive manufacturing device having a production container (12) for receiving the raw material (22) to be processed, the production container (12) being variably adjustable with respect to its receiving volume for the raw material (22), the additive manufacturing device having a production base (2, 24) on which the product is produced in three-dimensional layers during operation of the additive manufacturing device by means of the immersion bath stereolithography process, wherein the production container (12) has an adjustable base (3, 25), by the adjustment of which the receiving volume of the production container (12) can be variably adjusted, wherein the production base (2, 24) is decoupled from the adjustable base (3, 25) and can be moved separately from the adjustable base (3, 25) by means of a height adjustment mechanism (33, 34), the production base (2, 24) being arranged above the adjustable base (3, 25), characterized in that the production base (2, 24) is connected to the height adjustment mechanism (33, 34) at the top of the production container (12).
2. Additive manufacturing device according to claim 1, characterized in that the production container (12) has at least one vertically and/or horizontally adjustable piston, by the adjustment of which the receiving volume of the production container (12) can be variably adjusted.
3. Additive manufacturing device according to claim 1 or 2, characterized in that the production container (12) is open to the surrounding atmosphere, i.e. not gas-tight, at least in the region of the production base (2, 24) in which the product is produced in three-dimensional layers by means of the immersion bath stereolithography process during operation of the additive manufacturing device.
4. Additive manufacturing device according to one of the preceding claims, characterized in that the adjustable base (3, 25) has a plurality of individual base segments (35, 36, 37) which can be adjusted in height separately from one another.
5. Additive manufacturing device according to one of the preceding claims, characterized in that the adjustable base (3, 25) is designed in the manner of a piston, which has at least one seal (10) on the outer circumference.
6. Additive manufacturing device according to claim 5, characterized in that the adjustable base (3, 25) is composed of a plurality of individual segments, between each of which a seal (10) is arranged.
7. Additive manufacturing device according to one of the preceding claims, characterized in that the additive manufacturing device has at least one conveying mechanism (29) for supplying and/or discharging the raw material (22) from and/or in a raw material storage container (28) into the production container (12). In addition, excess material is also discharged by means of an overflow.
8. Additive manufacturing device according to claim 7, characterized in that the additive manufacturing device has at least one heating device for heating the raw material (22) located in the raw material storage container (28) and or in the production container (12).
9. Additive manufacturing device according to one of the preceding claims, characterized in that the manufacturing container (12) has one or more adjustable side walls (141, 160, 161, 162, 163), by the adjustment of which the receiving volume of the production container (12) can be variably adjusted, and wherein the adjustable side walls (141, 160, 161, 162, 163) have seals which seal the production container (12) to an unchangeable base plate located underneath.
10. Additive manufacturing device according to one of the preceding claims, characterized in that the production container (12) is designed in the manner of a folding bucket, in the manner of an adjustable baking frame, in the manner of an adjustable springform pan or according to the iris diaphragm construction principle.
11. Additive manufacturing device according to one of the preceding claims, characterized in that the production container (12) has a circular, square or rectangular cross-section.
12. Immersion bath stereolithography method for the layer-by-layer production of a three-dimensional product (21) from a liquid raw material (22) by means of an additive manufacturing device according to one of the preceding claims, characterized in that before, during and/or after the manufacturing process of the three-dimensional product (21), the receiving volume of the production container (12) is adjusted in one or more steps.
13. Immersion bath stereolithography process according to claim 15, characterized in that the receiving volume of the production container (12) is adjusted during the production process after one layer of the product (21) has been completely produced and before the start of production of the next layer of the product (21).