Hi Hakim,
Naturally, when you pull the block face, the side face will compress, and it depends upon the material's elasticity and the amount of force applied. But if you want to restrict the deformation, then it must be anything that can provide support from the inside. You can make supports inside the box at a distance of 5 mm from the side of the box and provide contact between them so that the side of the box may not move inside more than 5 mm.
Regards,
Sampat
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