Hähnel, H. Ateş, A. Ratzinger, U. JACoW Publishing Geneva, Switzerland 2673-5547 978-3-95450-240-0 10.18429/JACoW-HIAT2022-TU1C4 English 41-45 cavity vacuum linac simulation experiment Contribution to a conference proceedings 2022 2022-08 https://doi.org/10.18429/JACoW-HIAT2022-TU1C4 https://jacow.org/hiat2022/papers/tu1c4.pdf Additive manufacturing ("AM" or "3D printing") has become a powerful tool for rapid prototyping and manufacturing of complex geometries. A 433 MHz IH-DTL cavity has been constructed to act as a proof of concept for additive manufacturing of linac components. In this case, the internal drift tube structure has been produced from 1.4404 stainless steel using 3D printing. We present the concept of the cavity as well as first results of vacuum testing and materials testing. Vacuum levels sufficient for linac operation have been reached with the AM linac structure.