Use of a dispenser attachment , in particular a dispenser attachment for microscopy objectives, in a device for writing three-dimensional structures by means of laser lithography in a lithography fluid which can be solidified by means of irradiation using laser light, the device comprising: - a laser beam source for emitting a writing beam ; - a substrate for receiving lithography fluid ; - an objective for forming a focus region of the writing beam in the lithography fluid , the objective comprising an objective housing and an exit lens ; the dispenser attachment comprising: - a dispenser housing which is designed to be placed on the objective such that a fluid space is formed between the objective housing and the dispenser housing and such that an outlet gap is formed between the dispenser housing and the exit lens ; and - a fluid inlet into the fluid space , wherein the following steps are carried out for use: - providing a lithography fluid which is adapted to the laser beam source such that solidification takes place only in the focus region and using a multi-photon process; - supplying the lithography fluid through the fluid inlet into the fluid space ; - applying a volume of lithography fluid through the outlet gap ; - introducing the writing beam through the objective into the volume of lithography fluid and locally solidifying the lithography fluid in the focus region by means of a multi-photon process for writing the three-dimensional structure. the device comprising: - a laser beam source for emitting a writing beam ; - a substrate for receiving lithography fluid ; - an objective for forming a focus region of the writing beam in the lithography fluid , the objective comprising an objective housing and an exit lens ; - a laser beam source for emitting a writing beam ; - a substrate for receiving lithography fluid ; - an objective for forming a focus region of the writing beam in the lithography fluid , the objective comprising an objective housing and an exit lens ; the dispenser attachment comprising: - a dispenser housing which is designed to be placed on the objective such that a fluid space is formed between the objective housing and the dispenser housing and such that an outlet gap is formed between the dispenser housing and the exit lens ; and - a fluid inlet into the fluid space , - a dispenser housing which is designed to be placed on the objective such that a fluid space is formed between the objective housing and the dispenser housing and such that an outlet gap is formed between the dispenser housing and the exit lens ; and - a fluid inlet into the fluid space , wherein the following steps are carried out for use: - providing a lithography fluid which is adapted to the laser beam source such that solidification takes place only in the focus region and using a multi-photon process; - supplying the lithography fluid through the fluid inlet into the fluid space ; - applying a volume of lithography fluid through the outlet gap ; - introducing the writing beam through the objective into the volume of lithography fluid and locally solidifying the lithography fluid in the focus region by means of a multi-photon process for writing the three-dimensional structure. - providing a lithography fluid which is adapted to the laser beam source such that solidification takes place only in the focus region and using a multi-photon process; - supplying the lithography fluid through the fluid inlet into the fluid space ; - applying a volume of lithography fluid through the outlet gap ; - introducing the writing beam through the objective into the volume of lithography fluid and locally solidifying the lithography fluid in the focus region by means of a multi-photon process for writing the three-dimensional structure. <EOS>