I made the model and its a spare part for the axle holder from the Playmobil City Action Set with the number 9466 Fire Truck. So if your kids also lost the part, here you go and don't forget to post a make. :-)
I will recommend to print it with a 0.07 layer height and a 0.25 Nozzle for this small part. I printed it with Prusament ASA and 4 Perimeters and 20% Infill for the perfect durability and flex.
Also i uploaded a GCODE File with a support structure and a air chamber for the ASA Part.
The author marked this model as their own original creation.