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This Special Issue presents selected papers from the 8th

microtubes --- triple-coaxial flow --- microbes --- microfluidics --- bioremediation --- crack configuration --- metal conductive track --- stretchable elastomer --- flexible electronic device --- stretchable electronic device --- ion concentration polarization --- ion depletion zone --- Nafion --- microfluidic device --- pH indicator --- fluorescein isothiocyanate (FITC) --- 3D shape reconstruction --- shape from silhouette --- 3D printing --- additive manufacturing --- micro-stereolithography --- transparent object --- photopolymer --- direct writing --- femtosecond laser --- reductive sintering --- thermoelectric film --- Cu-Ni alloy --- micropatterns --- printing --- artificial cochlea --- MEMS --- piezoelectric material --- outer hair cell --- tactile sensor --- proximity sensor --- slipping detection --- microcantilever --- microfluidics --- microfiber spinning --- alginate hydrogel --- fatigue --- dye-sensitized photovoltaic cells --- wearable --- blink --- sensors --- micro/nano technology --- microfabrication --- stretchability --- thermoelectric generator --- flexible device --- origami --- cellular automata --- Game of Life --- reaction-diffusion system --- self-organization --- Turing pattern model --- Young model --- ATP --- microfluidic device --- luciferin–luciferase assay --- polydimethylsiloxane --- parasitic capacitance --- ultraviolet treatment --- capacitive force sensor --- n/a

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The continuous miniaturization of products and the growing complexity of their embedded multifunctionalities necessitates continuous research and development efforts regarding micro components and related micro manufacturing technologies. Highly miniaturized systems, manufactured using a wide variety of materials, have found application in key technological fields, such as healthcare devices, micro implants, mobility, communications, optics, and micro electromechanical systems. Innovations required for the high-precision manufacturing of micro components can specifically be achieved through optimizations using post-process (i.e., offline) and in-process (i.e., online) metrology of both process input and output parameters, as well as geometrical features of the produced micro parts. However, it is of critical importance to reduce the metrology and optimization efforts, since process and product quality control can represent a significant portion of the total production time in micro manufacturing. To solve this fundamental challenge, research efforts have been undertaken in order to define, investigate, implement, and validate the so-called “product/process manufacturing fingerprint” concept. The “product manufacturing fingerprint” concept refers to those unique dimensional outcomes (e.g., surface topography, form error, critical dimensions, etc.) on the produced component that, if kept under control and within specifications, ensure that the entire micro component complies to its specifications. The “process manufacturing fingerprint” is a specific process parameter or feature to be monitored and controlled, in order to maintain the manufacture of products within the specified tolerances. By integrating both product and process manufacturing fingerprint concepts, the metrology and optimization efforts are highly reduced. Therefore, the quality of the micro products increases, with an obvious improvement in production yield. Accordingly, this Special Issue seeks to showcase research papers, short communications, and review articles that focus on novel methodological developments and applications in micro- and sub-micro-scale manufacturing, process monitoring and control, as well as micro and sub-micro product quality assurance. Focus will be on micro manufacturing process chains and their micro product/process fingerprint, towards full process optimization and zero-defect micro manufacturing.

micro-injection moulding --- quality assurance --- process monitoring --- micro metrology --- positioning platform --- Halbach linear motor --- commercial control hardware --- diffractive optics --- gratings --- microfabrication --- computer holography --- manufacturing signature --- process fingerprint --- Fresnel lenses --- injection compression molding --- injection molding --- micro structures replication --- confocal microscopy --- optical quality control --- uncertainty budget --- optimization --- precision injection molding --- quality control --- process monitoring --- product fingerprint --- process fingerprint --- electrical discharge machining --- electrical discharge machining (EDM) --- surface roughness --- surface integrity --- optimization --- desirability function --- satellite drop --- electrohydrodynamic jet printing --- charge relaxation time --- laser ablation --- superhydrophobic surface --- process fingerprint --- product fingerprint --- surface morphology --- artificial compound eye --- multi-spectral imaging --- lithography --- spectral splitting --- plasma-electrolytic polishing --- PeP --- surface modification --- finishing --- electro chemical machining --- ECM --- Electro sinter forging --- resistance sintering --- electrical current --- fingerprints --- electrical discharge machining --- micro drilling --- process monitoring --- quality control --- electrochemical machining (ECM) --- process control --- current monitoring --- current density --- surface roughness --- inline metrology --- haptic actuator --- impact analysis --- high strain rate effect --- damping --- 2-step analysis --- micro-grinding --- bioceramics --- materials characterisation --- dental implant --- microinjection moulding --- process fingerprints --- flow length --- quality assurance --- n/a