My KitchenAid dishwasher (W10311121B) rack kept falling off due to a worn out part that keeps the metal rails on. I designed and thoroughly tested a new part.
Old Part
Called a stop clip and sells for $6.72 online or $17.51 on amz.


New Part


Inner forks lock part into metal slot holes.
Printed in PETg, 50% infill. Angled on print bed for strength. Support required.
Similar in purpose to @SchmitzBert's design, but bulkier.

The author marked this model as their own original creation.