This study is designed to identify relationships between structure and magnetic properties characteristic of coordination polymers (CPs). By determining the ground state 3D magnetic structure of {[Cu(HCOO)3]H2N(CH3)2}n, a CP exhibiting quasi-1D magnetism despite a 3D covalent structure, we will be able to address the factors that regulate the strength and nature of the super-exchange magnetic couplings, as well as correlation between the orientation of the magnetic moments and crystal-field anisotropy produced by the Jahn-Teller effect. To achieve this goal the unique information retrieved from powder neutron diffraction as a function of temperature will be compared with the results of DFT simulations, experimental charge density analysis, and magnetic susceptibility.