The so-called fourth-generation biodegradable vascular stent has become a research hotspot in the field of bio-engineering because of its good degradation ability and drug-loading characteristics. However, the preparation of polymer-degraded vascular stents is affected by known problem such as poor process flexibility, low forming accuracy, large diameter wall thickness, limited complex pore structure, weak mechanical properties of radial support and high process cost. In this study, a deposition technique based on a high-voltage electric-field-driven continuous rotating jet is proposed to fabricate fully degraded polymer vascular stents. The experimental results show that, due to the rotation of the deposition axis, the deposition direction of PCL (polycaprolactone) micro-jet is always tangent to the surface of the deposition axis. The direction of the viscous drag force is also consistent with the deposition direction of the jet. It is shown that by setting different rotation speeds of deposition axis ω and linear motion speeds of the nozzle V, the direction of rotation, pitch and angle of the individual printed spiral curve can be precisely tuned. In the process of multiple spiral curves matching the deposition forming thin wall tube mesh, the mesh shape and size of the thin wall tube can be accurately controlled by changing the number of matching spiral curves and the size of the matching position bias distance. Finally, the characteristics of a PCL tubular stent sample (with uniform-size microfibers and mesh shape), fabricated under the appropriate process parameters are described in detail.

Ink-jetting printing stands out among various conformal additive manufacturing techniques for its multi-material, digital control, and process flexibility. Ink-jetting-based conformal additive manufacturing is renowned for its adaptability to complex topological surfaces and is emerging as a critical technology for future comprehensive conformal printing systems. This review highlights the distinctiveness of four primary ink-jetting printing techniques in conformal additive manufacturing—piezoelectric jetting, thermal bubble jetting, aerosol jetting, and electrohydrodynamic jetting—and delves into how these attributes endow ink-jetting printing with unique advantages in conformal processes. Furthermore, leveraging these advantages, the review discusses potential applications in conformal electronics, energy devices, biology, and electromagnetics to bolster the ongoing development and application. Considering the current state of this technology, the review identifies critical challenges for future advancements, such as dynamic surface printing, integrated fabrication of multifunctional conformal structures, and the balance between resolution and throughput. This review summarizes the latest research and technological advancements in ink-jetting-based conformal additive manufacturing, aiding in its innovative applications and enhanced manufacturing capabilities in the future.

Laboratory safety management plays an important role in guaranteeing the normal operation of experimental tasks and ensuring the safety of experimental personnel. This paper combines the actual situation of metal additive laboratories in universities, analyzes the characteristics of metal additive manufacturing technology, analyzes the common safety hazards of materials and instruments and equipment in metal additive laboratories, discusses the safety management initiatives in metal additive laboratories, and provides reference for the establishment of a long-term mechanism for safety management in metal additive manufacturing laboratories.