The 3D Printing of Freestanding PLLA Thin Layers and Improving First Layer Consistency through the Introduction of Sacrificial PVA
The 3D Printing of Freestanding PLLA Thin Layers and Improving First Layer Consistency through the Introduction of Sacrificial PVA
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独立式 PLLA 薄层的 3D 打印并通过引入牺牲 PVA 提高第一层的一致性
DOI：
10.3390/app11146320
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
R. Cameron
中科院分区：
文献类型：
--
作者：
D. Roper;Kyung‐Ah Kwon;S. Best;R. Cameron
熔丝制造 (FFF) 是一种通过编程的逐层沉积生产物体的廉价方法。对于多层、宏观尺度的印刷，只要除其他因素外，第一层粘附力足以在印刷过程中将零件固定到表面，就可以实现可接受的印刷。然而，在单层或几层结构的沉积中，第一层的一致性更为重要，并且是一个以前被忽视的问题。由于第一层打印优先考虑层与床的粘合，因此很难在不损坏的情况下去除薄层结构。通过使用生物活性丝并将微观特征纳入复杂的患者特异性支架中，可控薄结构的沉积在组织工程中具有潜力。本文介绍了推进薄的、可重复结构沉积的技术。 3D 打印的单个 PVA 和 PLLA 层的线性厚度变化表示为挤出因子和层间喷嘴移动的编程垂直距离（层间隔）的函数。牺牲 PVA 层被证明可以显着提高第一层的一致性，减少单层沉积中精细打印机校准的负担。通过这种方式，印刷的单 PLLA 层中随床层偏差的线性变化大大减少。此外，该技术还用于演示厚度约为 25 µm 的独立薄层的打印。
Fused filament fabrication (FFF) is an inexpensive way of producing objects through a programmed layer-by-layer deposition. For multi-layer, macro-scaled prints, acceptable printing is achieved provided, amongst other factors, first layer adhesion is sufficient to fix a part to the surface during printing. However, in the deposition of structures with a single or few layers, first layer consistency is significantly more important and is an issue that has been previously overlooked. As layer-to-bed adhesion is prioritised in first layer printing, thin layer structures are difficult to remove without damage. The deposition of controllable thin structures has potential in tissue engineering through the use of bioactive filaments and incorporation of microfeatures into complex, patient-specific scaffolds. This paper presents techniques to progress the deposition of thin, reproducible structures. The linear thickness variation of 3D-printed single PVA and PLLA layers is presented as a function of extrusion factor and the programmed vertical distance moved by the nozzle between layers (the layer separation). A sacrificial PVA layer is shown to significantly improve first layer consistency, reducing the onus on fine printer calibration in the deposition of single layers. In this way, the linear variation in printed single PLLA layers with bed deviation is drastically reduced. Further, this technique is used to demonstrate the printing of freestanding thin layers of ~25 µm in thickness.
用于合规可穿戴和植入设备的生物力学定制网格的增材制造
影响因子：
19
作者：
Pattinson, Sebastian W.;Huber, Meghan E.;Kim, Sanha;Lee, Jongwoo;Grunsfeld, Sarah;Roberts, Ricardo;Dreifus, Gregory;Meier, Christoph;Liu, Lei;Hogan, Neville
通讯作者：
Hogan, Neville