Large-scale Fused Deposition Modeling (FDM) allows deposition defects, uneven textures and voids inherent in the additive process to be seen. Tru-Design used traditional finishing methods to finish Oak Ridge National Laboratory’s 3D printed Shelby Cobra replica. This effort highlighted the need for a low-cost, high-adherence, thermally-stable primer for carbon fiber-filled materials typically used in large-scale room temperature FDM processes.
A sprayable, structural coating for large-scale FDM products has been developed that provides a machinablesurface to achieve dimensional accuracy from additive manufacturing (AM) processes. This patent-pending coating –TD Coat RT –has been used on several proof of concept projects to demonstrate the efficacy of coatings for room temperature tooling applications.