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Lattice Optimization Keeps failing

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Hi everyone, I am pretty new to the software and would like to ask for opinions and help about why my lattice optimization keeps failing. I have attached a copy of the model. The final design is based on results of topology optimization on the initial design. What I will like to do is compare the stiffness of the model before and after lattice optimization. I ran FEA on the final design (which I intend to do after lattice optimization). However, the lattice simulation keeps failing. Initial thoughts would be: part too thing or constrained (I can't violate this thickness since it is part of the part specification). Can anyone help or suggest what to do please? Are there other probable reasons why this keeps failing, what are the solutions? 

Thank you.



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