BSST-3D Printing

BBST

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BSST Team | ZWU

2024.6

3D printing, also known as stereoscopic printing or additive manufacturing, is a technology that manufactures physical parts based on 3D CAD data through the method of layer-by-layer material accumulation. The core principle of this technique is to add materials layer by layer, transforming the digital design into a physical object.

The Selective Laser Sintering (SLS) process was first proposed by American Carl Deckard in 1989, and DTM Company launched the commercial production equipment for this process in 1992.
Current research status of SLS technology: DTM Company and 3D Systems Company in the United States, EOS Company in Germany; Domestic companies such as Beijing Longyuan Automatic Forming System Co., Ltd. and Huazhong University of Science and Technology. At present, significant achievements have been made in RP molding systems, SLS molding machines, metal powder research, sintering theory, scanning paths, and other areas in China.

1.3D printer background

2.new application, new technology about material,machine,new paper

3.SLS 3D Printing

4. Advantages and disadvantages of SLS process

Course → 3D Printing

https://mo.mbd.baidu.com/r/1lrqLZVTyqQ?f=cp&rs=3686669284&ruk=nkomwqMWdZ5oHqM2DexJvg&u=2700e6c310f8f402

Advantage:

Diversity of molding materials and low cost. This is the most prominent feature of SLS. In theory, materials that can form atomic connections between powders after laser heating can be used as SLS forming materials. At present, commercialized materials mainly include plastic powder, wax powder, coated metal powder, ceramic powder coated with adhesive on the surface, coated sand, etc.
There are almost no requirements for the shape of the parts. Due to the fact that the powder in the lower layer naturally becomes the support for the upper layer, SLS has self-supporting properties and can manufacture any complex shape, which many RP technologies do not possess. Forming is not limited by the inability of traditional machining tools to reach certain surfaces.
High material utilization rate. Unsintered powder can be reused.
The parts have good mechanical properties. The finished product can be directly used for functional testing or small batch use.
Realize integrated design and manufacturing. The supporting software can automatically convert CAD data into layered STL data, generate CNC codes based on layer information, and drive the forming machine to complete layer by layer processing and stacking of materials without human intervention.

The equipment cost is high.
The interior of the product is loose and porous, with high surface roughness and low mechanical properties.
The quality of the parts is greatly affected by the powder, making it difficult to improve.
The maximum size of parts that can be manufactured is limited.
The molding process consumes a lot of energy and the post-processing process is complex.

Disadvantage:

Materials: There are many materials for 3D printing, including plastics, metals, ceramics, gypsum, and even biomaterials. Which material you choose depends on the functional and performance needs of the object you are printing on. For example, plastics are commonly used to print models and prototypes, while metals are often used to print structural parts.
Machines: There are many types of 3D printers, including fused deposition modeling (FDM) printers, stereolithography (SLA) printers, selective laser sintering (SLS) printers, etc. Different types of printers are suitable for different applications, such as FDM printers are often used to print plastic parts, and SLS printers are often used to print metal parts.
New applications: With the development of 3D printing technology, its application fields are also expanding. For example, in the medical field, customized prosthetics and medical devices can be printed; In the field of construction, complex building components can be printed; In the field of art, it is possible to print beautiful works of art.
New technologies: 3D printing technology is also constantly evolving and innovating. For example, 4D printing is an emerging technology that can print objects that change shape over time. In addition, multi-material 3D printing is also a research hotspot, which can print multiple materials in the same object to achieve more complex functions and properties.

Refrence: http://pfxbzlx.gdvdc.com/CN/10.3969/j.issn.1674-8468.2023.04.014

printing has significant application potential in the field of skin repair. Researchers can maximize skin activity and other natural properties by integrating different extracellular matrices into skin 3D printing technology, thereby achieving effective repair of damaged skin and fusion with normal skin. In addition, for patients with severe skin burns caused by fires, 3D printing technology can quickly and accurately print materials containing skin cells, construct biomimetic skin structures, thereby shortening the treatment cycle and reducing postoperative scars.

Application of in situ skin bioprinting

In situ skin bioprinting utilizes inkjet bioprinting technology, which uses handheld devices or robot automation systems to directly print cell filled bioprinting onto the human wound site [6]. This bioprinting method can print concentrated skin cell suspensions onto wounds to accelerate their healing. Hakimi et al. [14] developed a handheld 3D in situ bioprinter that can be directly printed in mouse and pig wound models, with cells forming skin patches in situ on the wound. Albanna et al. [6] used portable inkjet bioprinters and laser bioprinters to print high-density suspensions of human fibroblasts and keratinocytes onto full-thickness skin excised wounds in experimental mice using fibrin collagen bioprinters. The skin structure printed on the wound retains a high cell density, and for up to 6 weeks after printing, human cells can also be observed in the tissue. Compared to untreated and cell-free grafts, direct in situ skin 3D bioprinting therapy leads to faster wound healing.
Skardal et al. [7] also evaluated the role of stem cell-derived seed cells in wound healing by using a robotic inkjet bioprinter to directly print amniotic fluid derived stem cells (AFSC) and fibrin collagen bioprinters carrying bone marrow mesenchymal stem cells (BM-MSCs) onto the wounds of mice undergoing full layer skin resection. Compared with the pure gel control group, the mice treated with AFSCs and BM MSCs had faster wound closure and epidermal formation. In another experiment to regulate paracrine activity at the wound site, Skardal et al. [7] printed heparin coupled hyaluronic acid hydrogel containing AFSCs directly on the wound of full-thickness skin resection. The hydrogel can isolate the cytokines secreted by AFSC in situ, extend paracrine activity, and make the full-thickness wound faster closed and vascularized. The main advantage of in situ bioprinting is the ability to layer cell ink based on the precise shape of the wound, making it particularly suitable for treating irregularly

5.find new reseach or application

6.Use slice software to setting parameter