Invalid Mesh while thickening curves

I’m trying to Thickening these curves to create solid lattice out of it so that can be 3d printed I tried some ways but in results I get invalid mesh any help will be appreciated how to create Vaild watertight mesh so I can further use it for analysis part also

mesh thickening issue.3dm (1.2 MB)

Check if it’s 3d printable or not…

Curve (107.0 KB)
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When I connect the mesh with grasshopper plugin intralattice mesh report battery it show’s Vaild mesh. But after baking it in rhino checking it with rhino meshrepair command it says invalid mesh. Why there is a double standard report b/w rhino and grasshopper. I’ll surely give a try in 3d printing @HS_Kim thanks