Unpacking device allowing residual raw material powder removal

An unpacking device (28) for use in an apparatus (10) for producing a three-dimensional work piece by irradiating layers of a raw material powder with electromagnetic or particle radiation, the unpacking device (28) comprises a holding device (32) which is configured to hold a building chamber arrangement (26). The building chamber arrangement (26) comprises a building chamber (20) accommodating a carrier (16), wherein the carrier (16) is configured to receive a three-dimensional work piece (18) produced from a raw material powder by an additive layering process. An engagement unit (38) of the unpacking device (28) is configured to engage with the carrier (16) of the building chamber arrangement (26). A moving mechanism (48) is configured to cause a relative movement between the building chamber (20) and the engagement unit (38) with the carrier (16) engaged therewith so as to allow a separation of the carrier (16) with a three-dimensional work piece (18) received thereon from the building chamber (20). Final