Box external protection

This is used to protect everyone's beloved boxThe structural design is very simpleAfter multiple adjustments and testsBalancing stability and ease of operationI have uploaded a file in F3D format. You can measure the size of the box and enter the size to obtain a customized modelAfter generating the model, please download the STL fileThis is very importantBecause if the size of the model is larger than the size of the printer you have chosenErrors may occur when exporting filesWhen printingPlease remember to add support