Drying Box Slide Stopper

This is an add-on to the excellent dessicant drying tray available from https://makerworld.com/en/models/62039?from=search#profileId-108470 . The lid of the drying tray can often slide open when the storage box is moved or tilted, which can lead to a spillage of the dessicant. This add-on prevents the lid from sliding open.