Runaway electrons (REs) pose dangers to tokamak plasma facing components (PFCs) due to their ability to deposit large amounts of energy onto localized wetted areas. This work explores the 3D dynamics of runaway electron (RE) impacts in SPARC to better understand the melt damage they can cause. The HEAT RE module is used to study M3D-C1 simulations of RE transport and loss due to field stochastization. RE impact footprints are calculated in HEAT. Comparisons between losses in M3D-C1 and HEAT are explored. 3D CAD is used to investigate the dynamics between 3D fields and realistic PFC geometries. We also explore the effect of PFC misalignment on impact wetted areas. This work is supported in part by Commonwealth Fusion Systems.