Sarah Tew/CNET Rounding up some of the best budget 3D printers, I learned a lot about the art and science of printing. It’s not as simple as loading a 3D file, hitting print and sitting back, although the extra steps and follow-up work involved is well worth it if you want to create eye-catching stuff. These are some of the big beginner questions I’ve gotten, and the major things I’ve learned through trial and error. Mostly error. These tips are deliberately simplified for a beginner audience. To really dive deep, check out the very active Reddit 3D printing community. Crazy things I’ve made on a 3D printer Now playing: Watch this: Tags Comment 18 Photos How food dye could help create 3D-printed lungs What material should I use to print with? Most home 3D printers use PLA or ABS plastic. Professional printers can use all sorts of materials, from metal to organic filament. Some printers use a liquid resin, which is much more difficult to handle. As a beginner, use PLA. It’s nontoxic, made mostly of cornstarch and sugarcane, handles easily and is inexpensive. However, it’s more sensitive to heat, so don’t leave your 3D prints on the dashboard of a car on a hot day. Which brand of PLA is best? Generally speaking, Hatchbox has never let me down, and runs about $20 for a full 1kg spool on Amazon. Some of the printers I tested only accommodate narrower 0.5kg spools. In those cases, I sometimes used a larger Hatchbox roll with a separate spool-holder (which, yes, I 3D-printed). Other times, I had good luck with AIO Robotics 0.5kg spools, which are a little more expensive, at $14 for 0.5kg. A 1kg roll prints a lot of stuff. Share your voice Computers 3D Printers 1 What color filament should I use? I found most prints look best in plain white, if you’re not going to otherwise prime or paint them. Primary colors are easy to use, but every time I tried something like a metallic or other unusual color, many of my prints were spotty or brittle. What settings should I use? Most 3D printers include or link to recommended software, which can handle converting 3D STL or other files into formats supported by the printer. Stick with the suggested presets to start, with one exception. I’ve started adding a raft, or bottom layer of filament, to nearly everything I print. It has cut down dramatically on prints that don’t adhere to the bed properly, which is a common issue. If you continue to have problems, rub a standard glue stick on the print bed right before printing. What are supports? Your 3D models probably need some help to print properly, as these printers don’t do well with big overhangs — for example, an arm sticking out from a figure. Your 3D printer software can usually automatically calculate and add supports, meaning little stands that hold up all those sticking-out parts of the model. After the print is done, clip the supports off with micro cutters and file down any nubs or rough edges with hobby files. Where do I find things to print? Thingiverse.com is a huge online repository of 3D files for anything and everything you can think of. Pokemon chess set? It’s there. Dyson vacuum wall mount? It’s there. DIY Lego-style blocks? Yep. When you’re ready to create your own designs, there are a ton of software packages to choose from, but it’s easiest to start with the browser-based free TinkerCad app from Autodesk. Which 3D printer should I buy? Check out our roundup of entry level and step-up 3D printers for some initial ideas. Laptops with the best battery life: See the top laptops and 2-in-1 PCs with the longest battery life. Fastest gaming laptops, ranked: All the most-powerful gaming laptops tested in the CNET Labs. More news and reviews for PC and Mac laptops, tablets and desktops. 2:19 3D printing
This artist’s illustration depicts the destruction of a young planet or planets, which scientists may have witnessed for the first time using data from NASA’s Chandra X-ray Observatory.Credits: Illustration: NASA/CXC/M. Weiss; X-ray spectrum: NASA/CXC/MIT/H. M.GüntherStudying a dead distant planet could help humans to know more about the way in which Earth will finally die and perish, a new study report published in the journal Science says. Recently, researchers while monitoring a distant star in deep space stumbled upon an orbiting fragment of a dead, shattered planet, and experts believe that this could be actually a preview of Earth’s inevitable fate in the future.The study report claimed that the discovery of this planetary fragment orbiting around a white dwarf could shed light into the twilight years of planetary systems. Experts believe that the newly found planetary chunk could be actually a piece of the planet’s shattered core. Scientists also speculate that the planet might have perished brutally during the star’s death throes.Researchers also revealed it is quite remarkable that the dead planet’s fragments survived the extremely intense gravity of the white dwarf star.”The white dwarf’s gravity is so strong — about 100,000 times that of the Earth — that a typical asteroid will be ripped apart by gravitational forces if it passes too close,” said Christopher Manser, lead author of the study and a physicist at the University of Warwick in Coventry, England, said in a statement.The study report suggested that the planetary chunk might be orbiting around the star every two hours, and no larger than 250 miles in diameter to avoid being ripped apart by the white dwarf’s gravitational force.Scientists also revealed that both the dead star and the planetary chunk are located in our Milky Way, at a distance of 410 light years away from the Earth.Experts believe that Earth could also face a similar fate when the sun swells into a red giant. As the sun swells, it will consume Mercury, Venus, and Earth, and will later shrink turning into a white dwarf.
00:00 /00:51 To embed this piece of audio in your site, please use this code: Listen – / 6The Astros opened Minute Maid Park to fans Monday so they could watch Game Four on the big screen. And it was an exciting day for David and Sarah Oller. They had their first date at an Astros game and the team has been part of their lives ever since.David Oller says this season in particular has been fun to watch.“This year they’ve just come very far from where they have been. They’ve always done well but this year it seems like they’ve been able to progress forward.”And Sarah Oller says she has faith that the Astros will go all the way.“I’m so proud of them. I’m always proud of them because I really feel like they always do their best.”The Astros made it to the playoffs and the World Series as part of the National League. This is the farthest they’ve advanced since becoming part of the American League.During the upcoming AL championship series, the Astros will also open Minute Maid Park so fans can watch the away games on the giant screen. Share X
Share Laura Isensee/Houston Public MediaMichele Gay and Alissa Parker founded the nonprofit, Safe and Sound Schools, after their daughters Josephine and Emilie were killed in the Sandy Hook school shooting in 2012.This week, about 400 people are gathering in Houston for a national summit on school safety, including educators, law enforcement officials, counselors and architects. Two moms whose daughters were killed in the Sandy Hook school shooting are helping lead the event, which is also sponsored by Crime Stoppers of Houston and the regional service center of the Texas Education Agency.Beforehand, the two moms, Michele Gay and Alissa Parker, talked with News 88.7 about their nonprofit Safe and Sound Schools, their meeting with some Santa Fe families and how to improve school safety.Q: Can you tell me about Safe and Sound Schools?Michele Gay: The mission really is to help prepare schools for safety and that’s about helping them learn to better prevent, respond to and recover from any type of school-based tragedy. And that’s very much a personal mission for us, given that we founded the organization in honor of our daughters, Joey and Emilie.Q: I’m very sorry for your loss. With the summit coming up, can you tell me about the meeting that you’ve had with some of the Santa Fe families?Gay: It was a real blessing for us before embarking on this summit to be reminded of why we do this work — and just to sit and talk. We shared our personal experiences, our challenges in terms of recovery, things that we learned in hopes that, perhaps, we save them a couple of steps on the journey. And more than anything, just really encourage them to be kind to each other, kind to themselves. To know that it’s a marathon, not a race.Alissa Parker: It’s always really emotional for me to go and talk to people who’ve gone through something similar to what we have — in whatever capacity. It takes me back to that experience and that tragedy. And it reminds me why it’s so important to continue to be an advocate.Q: You said that you try to help them skip a few steps. What specifically do you mean?Parker: It’s not about skipping steps. It’s about thoroughly going through the steps. It’s about not trying to rush your process, to feel what you have to feel, to process what you have to process. Healing takes a long time. In fact, it goes on your entire life. So, I think it’s accepting that it’s a long process and having patience with yourself. Their process is their process and no one should tell them how to do it.Gay: Maybe saving missteps is a better way to phrase that, because there aren’t really any shortcuts, unfortunately. But I know for us, it was helpful to learn from others about some some pitfalls on the journey. It was shared with us early on that we would be served to keep our mission true to our girls. It became obvious that it would be helping communities come together around their schools and school safety. Avoiding the politics would be something that would save us a tremendous amount of heartache and personal pain and would really help us to to propel this positive legacy.Q: There’s been some very sad news in the last couple of weeks of continued trauma and loss both with Parkland and Sandy Hook. How much is this secondary trauma something that you worry about?Parker: I think that when a traumatic event occurs, the ripple effects last a very long time. It’s easy for people to underestimate how long those remain. It’s important for us to be able to identify those things in ourselves and identify those in the loved ones around us. Unfortunately, it’s not a perfect situation in which we can. It’s something that I think we want to wrap a pretty bow on and say, ‘We’re good. We did it. The end date is here. I have healed.’ But it’s not that simple.Gay: I would agree and the losses in Parkland, they rippled through us immediately. And then very shortly, the loss of our friend Jeremy (Richman) in Newtown just underscores how important it is that we stay connected, take care of each other, check on each other.We were talking with the other families — this is the club that no one wants to belong to. But it is the family that will never leave you and will take good care of you. We do have this sort of family across the country of survivors from tragedies like ours and some that are not quite like ours, but very tragic nonetheless. And we do, I feel, a very good job of sending each other a text from time to time, picking up the phone from time to time, doing a gut-check here and there. Keeping a watch on each other in a way that I think probably nobody else could.Q: Shifting gears for a moment to your mission and what you’re trying to do, what do you see as most lacking when it comes to school safety?Gay: There’s no shortage of people that want to do the right thing. It’s just that sometimes we get really comfortable in our silos. Maybe law enforcement doesn’t know what the school officials have been working on. And the school officials don’t necessarily know of some of the things that the school-based staff have been working on. So, I think collaboration is one of the greatest challenges and it also happens to be one of the things that caused us to put this summit together.Q: In the Texas Legislature right now, there are some bills to increase funding for school safety, especially for security and hardening schools. Do you feel like that is the way to go?Parker: I think that each of those different components are equally important. So, if you focus only on one, you drop the rest of the balls. It is a juggling act. So, yes, we support any legislation that funds any of those different components. But does one of them solve it all? No. It definitely is something that you have to balance, always.Gay: I would say one thing that we really dislike — and maybe that’s because we’re parents and I’m a former elementary school teacher — is the term of hardening schools. It sounds so cold. It sounds like that picture you might have in your mind of a school as a prison and that is certainly not what we are promoting when we talk about school security, school infrastructure, design and tools and technology. Yes, those things are tangible … But in this day and age, the amazing thing is that we can have those things and we can still have a warm, beautiful, inviting environment.This interview was edited for length and clarity.
By Sean Yoes, AFRO Baltimore Editor, email@example.comAuthor Lamont Carey’s latest book, The Transition: From One Hellhole to Another, continues his searing narrative about the perils of mass incarceration, which impacts millions of Americans on both sides of the wall.Although Carey, a native of Washington, D.C. crafts fictionalized stories about life in prison, they are born of his very real experience as a young Black man who was once caught up in perhaps the most vicious system of incarceration on the planet.Lamont Carey, an author, motivational speaker and filmmaker has published his seventh book, The Transition. (Courtesy Photo)“I was in prison, to keep…from being bored, I use to jump in rap battles and one of the guys challenged me to write a book, because he said I couldn’t battle,” said Carey during a phone interview. “And I wrote the book and I started being the institution favorite, everybody wanted to read the book. So, I kept writing books.”All of Carey’s books (The Transition is his seventh), give readers an intimate and ultimately authentic immersion into life in prison. “So, the books that I released are a guy’s journey through one of the worst prisons in the world. So, you get to see how prison works, how relationships work, how individuals chose to navigate based off of their experiences,” Carey said. But, the author, motivational speaker and filmmaker revealed what he experienced inside the system when he first entered it was nothing like he expected.“Prison was nothing like I thought it would be. I thought prison would be this constant battle of having to prove myself to protect me from being raped and all of that,” he said.“But, what prison actually was, well, you had two roads you could take; you could take that road where you live a life of violence and aggression, or you could take the road of programming. And initially, I took the road of violence, but then it was working against me,” Carey added. “I was losing good days and going to the hole. And so, I chose the other path so I could get home. So, people go to prison and sometimes lose sight of freedom and when you lose sight of freedom that’s when you become institutionalized.”Carey first hit the national stage as a spoken word artist in 2005 on HBO’s “Def Poetry Jam.” But, he said he had no expectation of where poetry would take him. “I wasn’t focused on being a change agent, I just was trying to infuse truth into the art, because a lot of people hadn’t come from that background and they were doing poems in the third person, so it wasn’t truth,” he said. “So, I just added, hard…straight from the streets kind of material and that material ended up having an impact because it gave other people, it made them see that their voice was being heard, and that somebody else shared their ideas,” Carey added.“And so from there I started getting invited to speak in jails and prisons and their communities and so I just latched onto that. Because it gave me the opportunity, all those bad experiences I had this was an opportunity to use them for good. So, I turned my mistakes and roadblocks to success.”Carey’s journey has taken him from seemingly divergent locations like Ames, Iowa to Africa. But, ultimately his message is universal, especially for people of color.“There is poverty everywhere, there are Black people everywhere trying to figure out how to come up,” he said.“There are Black people everywhere that succumb to the barriers. And then when I enter the room and talk about my challenges and how I overcame them, it gives hope.”
Citation: Salt and Paper Battery May One Day Replace Lithium Batteries (2009, September 15) retrieved 18 August 2019 from https://phys.org/news/2009-09-salt-paper-battery-day-lithium.html A new thin-film battery has electrodes made of polymer-coated paper and an electrolyte made of salt-soaked paper. A laboratory prototype shows the cell pressed between glass slides and packaged in an aluminum pouch. Credit: Maria Stromme, Uppsala University At Uppsala University in Sweden, researchers have developed a flexible battery made of two inexpensive materials: cellulose and salt. The cellulose is derived from a polluting algae found in seas and lakes. The algae’s walls contain cellulose that has a different nanostructure, which gives it 100 times the surface area. The battery is made by coating the paper, made from this cellulose, with a conducting polymer and inserting a salt-solution-soaked filter paper between the paper electrodes. Chlorine ions travel from the batteries positive terminal to the negative terminal while current is produced in the external circuit by the flow of electrons. The battery can be recharged in tens of seconds because the ions flow through the thin electrode quickly. In comparison to a lithium battery that would take 20 minutes to recharge. The salt and paper battery is still in the early stages of development as compared to other thin-film technologies. For a battery to be cost effective you need to able to obtain the material at relatively low cost and have a good manufacture process in place.The battery could be produced commercially in about three years and made available to distributors.Via: RSC and Technology Review© 2009 PhysOrg.com Nanoball Batteries Could Charge Electric Cars in 5 Minutes (PhysOrg.com) — Salt and paper battery can be used in many low-power devices, such as medical implants, RFID tags, wireless sensors and smart cards. This battery uses a thin-film which makes it an attractive feature for many portable devices that draws a low current. Explore further This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.