It is designed to make a case for electrical work, and can be created based on the size of the inside of the box.
Please feel free to holes or customize it yourself.

(Added 2025/11/10) I made a box that is firmly fixed.

[https://makerworld.com/ja/models/1980856-tablock-box-scad#profileId-2130763](https://makerworld.com/ja/models/1980856-tablock-box-scad#profileId-2130763)