This platform raises the kid about 10cm... for play or to reach the bottom of the bicycle ;-).
I printed it on prusa i3 mk3s+ with 0,4mm nozzle in PETG, 3 shells, line width of 0,6mm, except for 0,45mm external perimeters,15% rectilinear infill and 0,3 mm layer thickness.
The author hasn't provided the model origin yet.