Making an open top box with multiple sections

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I an using a free version os shapr3D with a bambu labs P1S printer. I am trying to create a simple open top box with multiple sections. Any tutorials available to help with this design<

2

How many sections you want to have?

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i would like 3 sections. I was able to make a simple open top box but could not figure out how to create 2 or mor sections

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