**4. Conclusions**

This paper reported the mechanical properties of a series of microlattices with struts near the single-track width of the laser powder bed fusion system used to produce them. The results show that such lattices could be produced successfully but the small strut thickness deviated from the designed value. It was shown that, in the limited range investigated here, the mechanical properties of microlattices produced by LBPF were strongly dependent on actual density and could therefore be predicted with some confidence using this measure alone. Compared to larger lattices, the dependence of the mechanical properties was stronger with density (higher slope in the Ashby–Gibson equation). In situ microCT imaging demonstrated that the largest deformations under compression occurred at the strut junctions. These images represent the first in situ images of a full microlattice structure's yielding behavior.

**Author Contributions:** Conceptualization, A.D.P.; Methodology, A.D.P., I.Y. (Ina Yadroitsava), and I.Y. (Igor Yadroitsev); Software, A.D.P.; Validation, A.D.P. and D.-P.K.; Formal Analysis, All; Investigation, A.D.P.; Resources, All; Data Curation, All; Writing-Original Draft Preparation, A.D.P.; Writing-Review & Editing, All; Visualization, All.

**Funding:** The authors thank the South African Research Chairs Initiative of the Department of Science and Technology and National Research Foundation of South Africa (Grant No. 97994), the Collaborative Program in Additive Manufacturing (Contract No. CSIR-NLC-CPAM-15-MOA-CUT-01).

**Conflicts of Interest:** The authors declare no conflict of interest.
