However, in December 1943, Krupp's factory was diverted to manufacture the Sturmgeschütz IV and, in the spring of 1944, the Vomag factory began production of the Jagdpanzer IV, leaving the Nibelungenwerke as the only plant still assembling the Panzer IV.
Porén, en decembro de 1943 a fabrica de Krupp desviouse para construír o Sturmgeschütz IV e, na primavera de 1944, a de Vomag iniciou a produción do Jagdpanzer IV, deixando á de Nibelungenwerke como única planta que aínda montaba o Panzer IV.