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1. A method of producing a 3D molded part, wherein particulate construction material is applied onto a construction field in a defined layer by means of a coater, one or more liquids or particulate material of an absorber are selectively applied in regions of the particulate construction material, and an energy input is effected into the particulate construction material by means of an infrared radiator passing over the construction field, the regions with selectively applied absorber being selectively fused by the energy input, the construction field being lowered by a layer thickness or the coater being raised by a layer thickness after the energy input, and these steps of applying particulate construction material, selectively applying absorber, effecting an energy input, and lowering the construction field or raising the coater being repeated until the 3D molded part is produced, characterized in that the method uses at least one spectrum converter arranged between the radiator and the construction field, the at least one spectrum converter comprising upstream and downstream radiation filters, the upstream filter being heated by long-wave thermal radiation generated by the radiator, and the downstream filter having a much lower temperature than the upstream filter so as to prevent particulate construction material whirled up by the coating process from melting and sticking to a surface of the downstream filter, the downstream filter leaving short-wave radiation generated by the radiator unaffected so as to produce the energy input.
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