Not sure, might be different. Like the infill might go side to side but walls go up and down. So increasing walls might still give more strength.

nah there's a difference in print line orientation on all the slicers I've used. When printing functional parts like that, especially mechanical ones, you really got to pay attention to printing orientations

For a use case like this it would be a good use case to do 3D printed casting.

3D print the part. Mold out of silicon. Then make the final part in resin.

Or just buy the real part.

There's also ways to make plastic parts via injection at home.

Yeah, even annealing it didn't help much. I think the original part of the injection-molded nylon was a bit under-specified.

It would have been a good project for metal, but it would have been 4 years in the box and cost more than the original ride-on.