Trailer coupling, hitch Duplo / Anhängerkupplung für Duplo

This is a trailer coupling for Duplo to attach the old waggons to the new cars which often don’t have one.

No support needed because of the chamfers in the lower part. Where the bearings have to be put in, perhaps some filament will hang down, but this can easily be removed.
I printed with a 0.4 mm nozzle using 0.35 mm for slicing. Perhaps different slicers or nozzle diameters will produce different wall thicknesses. So it could happen the parts won't fit that good with the other duplo parts. I hope this will not happen!