3D printers designed for lunar applications are specifically engineered to function in the extreme conditions of space and on the lunar surface. These printers undergo rigorous modifications to withstand factors like low gravity, extreme temperature fluctuations, and the presence of lunar dust (regolith). They often utilize techniques such as selective laser sintering (SLS) or fused deposition modeling (FDM) adapted to function in low-gravity environments. These printers incorporate shielding to protect against radiation, robust mechanisms to handle regolith as a printing material, and specialized components to operate reliably in vacuum conditions. The aim is to enable on-site manufacturing capabilities on the Moon, allowing astronauts to produce spare parts, tools, or even habitats using locally available materials, reducing the need for transporting heavy equipment from Earth.
Moreover, these lunar 3D printers often integrate automated systems and artificial intelligence to ensure accurate and autonomous operation in environments where human intervention might be limited. The printers are developed with a focus on sustainability and self-sufficiency, contributing to the vision of long-term lunar habitation and supporting extended space missions by reducing reliance on Earth for critical supplies and components.
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1. Confinement Controlled Swelling Mechanisms of Hydrogels in Multi-Material Architectures
Published: 2026 | Materials & Design
Authors: Ze Zhang, Mohamed Adel, Jianxian He, Yannan Li, Chaolun Xu, Yifan Pan, Rongyi Zhuang, et al. (full list unconfirmed — Google Scholar’s listing was truncated; Shinjiro Umezu presumed senior author but not directly verified)
Examines how rigid/semi-rigid surrounding material in a multi-material printed structure geometrically confines and redirects hydrogel swelling behavior. Unconstrained hydrogels swell isotropically, but embedding them within a stiffer printed architecture redirects swelling-induced stress and deformation — relevant to the group’s vascular stent, sensor, and 4D-printing work, where controlling (or exploiting) this confined swelling is key to programmed shape-change or structural stability. Description is partly inferred from the title and the group’s related published work; I was unable to access the full text, so treat specific mechanistic claims as inferred rather than confirmed.
2. Spatial Mechanical Enhancement Strategy Enabled by Multi-Axis Material Extrusion Additive Manufacturing
Published: January 31, 2025 | Journal of Manufacturing Processes, Vol. 134, pp. 762–774
Authors: Ze Zhang, Kewei Song, Yifan Pan, Jianxian He, Shinjiro Umezu
Layer-by-layer material extrusion printing is fundamentally limited by weak interlayer bonding, creating directional weaknesses. This study proposes a multi-degree-of-freedom (MDOF) spatial enhancement strategy using a six-axis printer: parts are divided at the design stage into “core” and “reinforcement” layers, with reinforcement deposited at controlled angles relative to the core to achieve true spatial (non-planar) anisotropy. Mechanical testing showed core-layer ratio, reinforcement-to-core raster angle, and reinforcement fill rate all strongly affect tensile, compressive, and bending performance, with a 5:5 core ratio, 90° angle, and 90% fill rate giving optimal results; SEM fractography clarified the strengthening/fracture mechanisms. This overcomes the classic weak-interlayer-bonding limitation of standard 3-axis extrusion, extending printability to freeform surfaces and complex load-bearing geometries, with noted applicability in aerospace, automotive, and biomedical structures — and to other multi-axis printing platforms beyond the group’s own six-axis system.
3. 3Dプリンタで製造した木粉・PLA樹脂複合材の力学的性質 (Mechanical Properties of Wood Powder/PLA Resin Composite Materials Manufactured by 3D Printer)
Presented: October 17–18, 2024 | 日本建築仕上学会 2024年大会学術講演会 (Japan Society of Finishing Technology, 2024 Annual Conference), Gifu Nagara River International Conference Center
Authors: Tatsuya Ida, Yukiko Homma, Shinjiro Umezu, Hiroto Takaguchi, Yuji Miyazu, Takehiro Wakita, et al.
Reports mechanical property testing (likely tensile strength, thermal-history effects) of a wood-powder/PLA composite filament fabricated via 3D printing. Shares several co-authors (Wakita, Takaguchi, Miyazu, Umezu) with the ISRU wooden-joinery project below, suggesting this composite serves as an accessible terrestrial analog material for testing joint geometries and print parameters ahead of work with actual regolith-based or space-qualified composites. As a conference proceeding, detailed quantitative results are not independently verifiable from public abstracts alone.
4. 3D Printed Joining System Inspired by Traditional Japanese Wooden Joinery for ISRU
Presented: July 29 – August 1, 2024 | 10th International Conference on Construction Engineering and Project Management (ICCEPM 2024), Sapporo, Japan
Authors: Yusuke Hozumi, Takehiro Wakita, Ayato Doki, Hiroto Takaguchi, Tatsuya Inden, Shinjiro Umezu, Yuji Miyazu
Addresses a core constraint of extraterrestrial construction: resupplying materials from Earth is slow and costly, so long-duration lunar/planetary habitation requires building with locally available or repurposed materials (In-Situ Resource Utilization, ISRU). Proposes a joining system inspired by Kigumi, traditional Japanese wooden joinery, which achieves strong, disassemblable connections without nails or adhesives. By attaching 3D-printed joints (informed by 3D scanning) to irregularly shaped raw materials, the system converts non-uniform elements into standardized, assemblable and disassemblable members — combining Kigumi’s structural and disassembly performance with digital fabrication for off-Earth construction.
5. 3Dプリンタ造形物の化学溶解仕上げ手法による表面粗さの変化 (Changes in Surface Roughness via Chemical Dissolution Finishing of 3D-Printed Parts)
Published: 2023 | 砥粒加工学会誌 (Journal of the Japan Society for Abrasive Technology)
Authors: Shinjiro Umezu, Kensuke Takagishi
Investigates a chemical-dissolution surface-finishing technique for FDM-printed parts, aimed at smoothing the layer-lines (積層痕) inherent to fused-deposition 3D printing without mechanical abrasion. A solvent partially dissolves and reflows the outermost printed layer, and the study characterizes how resulting surface roughness changes with process parameters. Connects to the same group’s broader line of work on FDM post-processing (including related conference papers on 3D chemical-dissolution finishing and its image-based evaluation), addressing a persistent practical limitation of low-cost FDM printing — visible layer artifacts — largely independent of any specific application domain.
6. FDM 3D Printing of ABS/Artificial Lunar Soil Composite Filament (About FDM 3D Printing Process of Artificial Lunar Soil)
Presented: September 5–8, 2021 | 日本機械学会 2021年度年次大会 (JSME 2021 Annual Conference), online, Presentation No. S143-04 | DOI: 10.1299/jsmemecj.2021.S143-04
Authors: Kewei Song, Xiangyi Meng, Jun Koyanagi, Shinjiro Umezu
The Moon is rich in regolith resources, and combining in-situ lunar soil utilization with intelligent manufacturing could substantially reduce dependence on Earth-launched payload for future space exploration. This study blends artificial lunar soil (ALS) simulant with ABS polymer powder and produces a printable filament via melt extrusion, enabling FDM 3D printing directly from the composite. Represents an early, foundational step in the group’s ISRU-oriented additive manufacturing research — evaluating whether lunar-soil-loaded thermoplastic filament can be reliably extruded and printed, a prerequisite for later structural applications like the Kigumi-inspired joinery system above.