The disclosure relates to a 3D printer including: a vat having an at least partially transparent bottom for receiving liquid photoreactive resin for producing a solid component; a building platform for pulling the component layer by layer out of the vat; a projector for projecting the layer geometry onto the transparent bottom; a transport apparatus for moving the building platform at least downward or upward in the vat; and a receiving apparatus for detachably connecting the building platform to the transport apparatus. The receiving apparatus includes a pivoting device for pivotally holding the building platform and is adapted to abut the underside of the building platform parallelly onto the transparent bottom of the vat when lowered by the transport apparatus. The 3D printer is provided without for the ability to completely block the pivotal movement of the pivotably held building platform.