This is a replacement crane support frame for the Märklin 48674 crane set, in case the original is broken or missing/lost.
The part is a little bit undersized, so that is snap-fits onto the crane car.
I printed this in Urban Grey Prusament PETG with default settings. It just needs to be placed with the flat (undecorated) side down.
The SCAD file is included. It references the library af-basics.scad which can be found here: https://www.printables.com/model/175914-openscad-library-for-more-basic-shapes
The author marked this model as their own original creation.