Method for manufacturing an object from a material by means of additive manufacturing using a plurality of solidifying devices (7, 7') for solidifying said material in stacked layers by means of electromagnetic radiation (71, 71'), said method comprising the steps of: - defining, by a data processing unit, at least two solidifying device allocations (101, 102, r a1 -r a4), wherein in each of said solidifying device allocations (101, 102, r a1 -r a4) said plurality of solidifying devices (7, 7') are allocated to respective parts (171, 171', 172, 172') of said layer such that said parts (171, 171', 172, 172') cover said layer, wherein said at least two solidifying device allocations (101, 102, r a1 -r a4) are substantially mutually different; - calculating, by said data processing unit, for each of said at least two solidifying device allocations (101, 102, r a1 -r a4), respective allocated part manufacturing times representing times for each of said plurality of solidifying devices (7, 7') for solidifying said respective allocated part (171, 171', 172, 172') of said layer, wherein said calculating takes into account an expected disturbance area from solidifying said material by one of said plurality of solidifying devices (7, 7'), wherein said disturbance area relates to at least an expected fume and/or splashes above said layer; - determining, by said data processing unit, for each of said at least two solidifying device allocations (101, 102, r a1 -r a4), the respective layer manufacturing throughput time for said layer, wherein a respective layer manufacturing throughput time equals the longest of said calculated allocated part manufacturing times for said layer; - selecting, by said data processing unit, a definite allocation of said plurality of solidifying devices (7, 7') based on said determined layer manufacturing throughput times, and using said definite allocation for manufacturing said layer with said plurality of solidifying devices (7, 7'). - defining, by a data processing unit, at least two solidifying device allocations (101, 102, r a1 -r a4), wherein in each of said solidifying device allocations (101, 102, r a1 -r a4) said plurality of solidifying devices (7, 7') are allocated to respective parts (171, 171', 172, 172') of said layer such that said parts (171, 171', 172, 172') cover said layer, wherein said at least two solidifying device allocations (101, 102, r a1 -r a4) are substantially mutually different; - calculating, by said data processing unit, for each of said at least two solidifying device allocations (101, 102, r a1 -r a4), respective allocated part manufacturing times representing times for each of said plurality of solidifying devices (7, 7') for solidifying said respective allocated part (171, 171', 172, 172') of said layer, wherein said calculating takes into account an expected disturbance area from solidifying said material by one of said plurality of solidifying devices (7, 7'), wherein said disturbance area relates to at least an expected fume and/or splashes above said layer; - determining, by said data processing unit, for each of said at least two solidifying device allocations (101, 102, r a1 -r a4), the respective layer manufacturing throughput time for said layer, wherein a respective layer manufacturing throughput time equals the longest of said calculated allocated part manufacturing times for said layer; - selecting, by said data processing unit, a definite allocation of said plurality of solidifying devices (7, 7') based on said determined layer manufacturing throughput times, and using said definite allocation for manufacturing said layer with said plurality of solidifying devices (7, 7').