Recommend increase infill density to 30-50% and also increase wall and shell layers to 5 or so.
The author remixed this model.
Took the original models and strengthened the back wall, shortened the tray sides and knubbed the middle top pegs. The knubbing of the center pegs was for two reasons … first was the same as reason the back wall was strengthened … removal is easier, however the other reason is I have many pegs that are unusable in my shop due to the spacer behind running up the stud and blocking the holes so I wanted to put the trays to span those areas.