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Lamp black ink
2021/09/13-18:35:13

From: https://archive.org/details/distillationofre00schwrich/page/n5/mode/2up?ref=ol&view=theater


Toilet paper printer
2021/09/12-22:49:43

Info and pics.


Hydra-MMM Prototype
2021/09/04-21:37:50

Hydra is a multi-headed manufacturing machine. The general idea is to make a personal manufacturing machine that will be able to perform multiple, simultaneous operations such as milling, additive prototyping, pcb fabrication, laser etching, etc.


Centrifugal melt spinning for distributed manufacturing of N95 filtering facepiece respirators
2021/08/31-16:20:51

"The COVID-19 pandemic has caused a global shortage of personal protective equipment. While existing supply chains are struggling to meet the surge in demand, the limited supply of N95 filtering facepiece respirators (FFRs) has placed healthcare workers at risk. This paper presents a method for scalable and distributed manufacturing of FFR filter material based on a combination of centrifugal melt spinning utilizing readily available cotton candy machines as an example. The proposed method produces nonwoven polypropylene fabric material with filtering efficiency of up to 96% for particles 0.30-0.49 {\mu}m in diameter. We additionally demonstrate a scalable means to test for filtration efficiency and pressure drop to ensure a standardized degree of quality in the output material. We perform preliminary optimization of relevant parameters for scale-up and propose that this is a viable method to rapidly produce up to one million N95 FFRs per day in distributed manner with just six machines per site operating across 200 locations. We share this work as a starting point for others to rapidly construct, replicate and develop their own affordable modular processes aimed at producing high quality filtration material to address the current FFR shortage globally."


IBM Selectric typewriter font 3dprinted typeball
2021/08/24-10:42:39

"The IBM Selectric changed typewriters as we knew them. Their distinctive ball element replaced the clunky row of typebars and made most people faster typists. When [Steve Malikoff] thought about 3D printing a type ball — colloquially known as a golf ball — it seemed like a great idea."


Low-cost seismograph using optical mouse
2021/08/23-16:22:02

"The seis-mouse-meter (a name coined by our team) is an outcome of the 2020 Frugal Science course (frugalscience.org), where we participants were challenged with solving crowd sourced global problems with frugal solutions. Our chosen problem was to detect and warn of crop raiding elephants in rural India, which cause much damage and human animal violent conflict inducing loss of lives on both sides.

Our simple hack was to use an ordinary computer optical mouse's inbuilt high speed camera and surface features detection hardware as a vibration detector. This could be used to sense the long distance (about 10km) seismic waves generated in the ground when these heavy animals walk or rumble or talk to each other.

Such a device could be part of a frugal and low cost early warning system in vulnerable villages, preventing potential conflicts and losses. It could also act as an environmental tool to monitor anthropologenic noise pollution in the infrasound range."


Flexure-based Delta robot
2021/08/17-15:24:52

"Mesoscale electromechanical systems find applications in fields such as medical instrumentation, soft robotics, microscopy, flexible electronics and imagining. This paper implements the printed circuit MEMS (PC-MEMS) process 1 for the fabrication of a ‘pop-up’ flexure-based mesoscale system that exploits the simplicity of 2-D manufacturing techniques such as sheet-metal operations and laser cutting to realize a 3-D mechanism. The fabrication of a laminated Delta robot with prismatic actuation is presented to exemplify this process. A working device with actuation and functional components such as linear guides, stepper motors and limit switches is designed and fully realized. Because the mechanism is popped out of the plane to achieve its 3D shape, we present a stiffness analysis to arrive at the out-of-plane (or ‘pop-out’) angles that the planar system must accommodate so that constraints/limits on actuator torque/force can be can satisfied while producing an operational system. The simplicity of the processes makes it a candidate for the use in the emerging open-source hardware technologies for fabricating low-cost, complex, electromechanical systems."


Coffee maker parallel robot 3D printer
2021/08/16-17:44:39

There are many diy 3D printer designs available on the internet, this one is different.


Robust and Elastic Lunar and Martian Structures from 3D-Printed Regolith Inks
2021/08/16-12:30:15

"Here, we present a comprehensive approach for creating robust, elastic, designer Lunar and Martian regolith simulant (LRS and MRS, respectively) architectures using ambient condition, extrusion-based 3D-printing of regolith simulant inks. The LRS and MRS powders are characterized by distinct, highly inhomogeneous morphologies and sizes, where LRS powder particles are highly irregular and jagged and MRS powder particles are rough, but primarily rounded. The inks are synthesized via simple mixing of evaporant, surfactant, and plasticizer solvents, polylactic-co-glycolic acid (30% by solids volume), and regolith simulant powders (70% by solids volume). Both LRS and MRS inks exhibit similar rheological and 3D-printing characteristics, and can be 3D-printed at linear deposition rates of 1–150 mm/s using 300 μm to 1.4 cm-diameter nozzles. The resulting LRS and MRS 3D-printed materials exhibit similar, but distinct internal and external microstructures and material porosity (~20–40%). These microstructures contribute to the rubber-like quasi-static and cyclic mechanical properties of both materials, with young’s moduli ranging from 1.8 to 13.2 MPa and extension to failure exceeding 250% over a range of strain rates (10–1−102 min−1). Finally, we discuss the potential for LRS and MRS ink components to be reclaimed and recycled, as well as be synthesized in resource-limited, extraterrestrial environments."


Bioinks for 3D bioprinting: an overview
2021/08/14-22:01:09

"Bioprinting is an emerging technology with various applications in making functional tissue constructs to replace injured or diseased tissues. It is a relatively new approach that provides high reproducibility and precise control over the fabricated constructs in an automated manner, potentially enabling high-throughput production. During the bioprinting process, a solution of a biomaterial or a mixture of several biomaterials in the hydrogel form, usually encapsulating the desired cell types, termed the bioink, is used for creating tissue constructs. This bioink can be cross-linked or stabilized during or immediately after bioprinting to generate the final shape, structure, and architecture of the designed construct. Bioinks may be made from natural or synthetic biomaterials alone, or a combination of the two as hybrid materials. In certain cases, cell aggregates without any additional biomaterials can also be adopted for use as a bioink for bioprinting processes. An ideal bioink should possess proper mechanical, rheological, and biological properties of the target tissues, which are essential to ensure correct functionality of the bioprinted tissues and organs. In this review, we provide an in-depth discussion of the different bioinks currently employed for bioprinting, and outline some future perspectives in their further development."


Criado/Created: 2018

Última actualização/Last updated: 13-09-2021 [18:35]


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