The objective of the present report is to give a thorough description on how to implement a 3-Dimensional heat transfer solver applicable for the pultrusion process. The solver will use the
Alternate Direction Implicit method modified by Douglass & Gunn (3D-ADI-DG) . A similar solver was introduced for the first time in this specific field of application by Baran et al. .
The current report does however serve as a thorough introduction for the reader to create theirown solver with the associated benefits, e.g. understanding and control of all aspects of the
solver. The solver was developed, verified and validated following previous work by the authors  and used to investigate the effect of varying fiber volume fraction distribution on the cure
behaviour during the pultrusion process .