Tools used, in order:
1. Cart dump -- WAIN Card Dumper NX: https://gbatemp.net/threads/wain-card-dumper-nx.506700/
2. Keys dump -- Lockpick_RCM: https://github.com/shchmue/Lockpick_RCM/releases
3. Extract cart dump -- hactool: https://github.com/SciresM/hactool/releases
4. Model (.szs, .bfres) view & export to .dae -- Switch-Toolbox: https://github.com/KillzXGaming/Switch-Toolbox/releases
5. Model (.dae) convert to .stl ASCII -- Online Mesh Converter: https://meshconvert.com
6. Model "repair" and resize, then export (.stl) for import into 3D print modelling software -- Microsoft 3D Builder (comes with Win10)