At the time I prepare the drawings for the 3D printer. The definitive drawings (i not do not have such a 3D program) came from a friend in Germany, the printing is local. In fact, there are only some STL data to transfer by email...
There are many parts and sections who can be printed, form parts there are not available on the spare part market. LGB (Maerklin) don't produce spare parts anymore!
Cheers
trainmaster