A coupling or coupler is a mechanism, typically located at each end of a rail vehicle, that connects them together to form a train.

Model in 1/100 scale. The file sprzeg_all.stl should have dimensions 15x13.3x7.7. A significant loss of details will occur on this scale, it is best to print on a 1/25 scale, i.e. set 400%.The files contain a model in three different positions and a model divided into individual parts, which after printing can be folded and glued.