MOS SNCF 16T mineral wagon
Built for use in France at end of WW2. All eventually came back to work in Britain
Requires finishing off, wheels etc
Scale HO (1/87 , 3.5mm/ft)
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more 3d printed models from Recreation21 here
http://www.rue-d-etropal.com/3D-printing/3d_printed_designs.htm