Step 4: Using extrude tool divide your model into 3 parts.
Step 5: Perform these steps to all of 3 parts: Select the boundary of your model with the edges on corner of your model.
Step 6:
Select bevel and put its value equal 0.2

Step 7: Duplicate your model according x, y and z axis. And perform smooth or sub_d.
This tutorial is not only for Maya, you can use this method in any 3d software only tools names will be changed and nothing else.
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