Defaults are ok for this print but if you want to splurge a bit, I recommend 25% Gyroid infill.
The author remixed this model.
This remix offers 18.5cm (7" ¼) interior length (to fit 7in US pencils) and increased depth for additional storage (about 28.7mm or 1" ⅛).
Also added a small notch and indent for the lid to stay closed.. but TBH it's not going to last with PLA and frequent use. I tried lol.