Lattice inverse-design methods can generate cells that match prescribed effective properties, but property feasibility does not imply material efficiency. Removing redundant material from an existing lattice while preserving its homogenized elasticity ordinarily requires solving a separate constrained topology optimization problem for each cell, making large-scale refinement computationally expensive. We introduce SLIM (Structural Lightweighting via Implicit Mapping), a neural lattice-refinement model that replaces this per-instance iterative optimization with a single forward prediction. SLIM uses a dual-octree implicit network to predict the signed-distance field of a lightweight lattice and is trained on input--output pairs generated by property-constrained topology optimization. To improve stiffness preservation, we use homogenization sensitivities computed on the optimized target to estimate how residual voxel errors in a prediction affect its homogenized stiffness, and penalize this estimated change during training. Once trained, SLIM requires no topology optimization, homogenization analysis, or sensitivity evaluation during prediction. On the held-out test set of 906 lattices, SLIM achieves a mean relative volume-fraction reduction of 15.90%, a lightweighting success rate of 90.51%, and a mean normalized aggregate TO-target error of 0.636%, while reducing the average per-lattice generation time from 2516.0 s with direct TO to approximately 0.5 s. These results show that SLIM provides a fast neural surrogate for repeated topology-optimization-based refinement of 3D lattices.

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