Hello I am new to the Abaqus AM Modeler. I have made a simulation with mm,g,s,Celsius units and defined everything with consistent units I believe (including absolute zero temp -273.15 and Boltzman).  I have defined the ambient temperature and sink temp as 23 degree C, and I also gave the entire model as well as all nodes a pre-defined field temperature on the initial step of 23 degrees C. Still as the material and heat are deposited for my laser DED built, the minimum temperature continuously drops lower and lower until I finally get an error that says that the temperature has dropped below absolute zero temperature. 

Does anyone know what I might be missing here? I have checked everything over many times and am not sure where I could have gone wrong. 

Thank you so much for your time :)