Things I feel passionate about and want to share with others

I'd like to share with you and the whole community some ideas and spread the information.
No specific topics, just my hobbies and things I like, some might get more spotlight, some less.


814 total votes

Innovative and Novel DApps - Golem

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Hello Crowdholding community! Today, I would like to try something different as I want to showcase you a cool DApp I found that some of you may heard of. As the headline reveals, the DApp I want to share is called Golem.  I think the technology they offer is truly revolutionary and it just might be the next big thing. So, what is the purpose of Golem? Golem's vision is to have a giant, decentralized and accessible super-computer. What it means is you can rent a computing time of this super-computer and use its processing power. There are many usecases for this concept.  For example, rendering animations is an incredibly power-hungry process (it took almost 199 days of nonstop rendering to create movie 'Big Hero 6'!) and not everyone can afford to have the processing power Disney has. Many scientific projects could also find the use of such super-computer and it might lead to many new discoveries. We hear the word AI a lot more now but it is a bit hard accessible for the average developer. With having this extensive power available to creators, having many cool and exciting projects on the rise is bound to happen. So how exactly does it work? To participate, user can connect their computer to Golem's network, doesn't matter if it is a single computer or a massive farm. According to the power they provide, they receive GNT token. Tokens can be sold or you could buy more of them and rent the computing time of this super-machine. I like how the token has a natural and fluid cycle in this system With the appearance of using such farms for external gaming (look at Google Stadia), I think this project can have a very succesful future ahead. You could essentially play games in their highest definition on almost any sort of computer. So what do you think? I have some questions for you: Can you find some usescases where you would like to use this super-computer? Do you see the potential this project could bring? Is there something you would be critical about this DApp?
188 votes
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3D Printing Materials

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Hello Crowdholders! I would like to thank you for the lovely support on the previous task, I honestly didn't expect it. As I mentioned before, today I want to share different materials you can 3D print out of. The most conventional material is PLA. While its enviromental resistance is pretty weak, it is fairly cheap and you can get a decent roll of 1kg PLA for $20. It is often created by processing cornstarch. This is the reason of its degradation - it's a bioplastic. While the final product is strong, burying it in the ground decays it in a few years. To print with PLA, it needs to be heated up to around 200°C but it softens around 50°C, so its uses can be often limiting.  If the model needs to withstand certain conditions, a good compromise is to use PETG. It is based on PET, one of the most used type of plastic, be it bottles or textiles for example. The price of 1kg spool is almost identical as PLA. Its durability is pretty higher - to print PETG, it has to be heated up to 240°C and it softens around 80°C. Because of its decent temperature resistance, many parts on a 3D printer are actually printed as well and the material used is none other than PETG. Another benefit of PETG is that it is food safe, same as PLA. So why not switch to PETG altogether? It is not as forgiving material as PLA, consumes humidity and printing with it is a bit harder. Another common material is ABS. It has some pretty interesting attributes. While the printing temperature is same as PETG, it softens up around a 100°C. Unlike PETG and PLA, it is a bit flexible, but not too much. It has a nice matte finish and it is soluble in acetone, so it can render the layers pretty much invisible. It costs same as the previous materials, $20 for a 1kg. As grand as ABS sounds, it has its caveats. It produces unpleasant smell while prinitng and the material is very prone to warp and shrink while printing, like this:  To combat warping, the printer must be in a closed space and the ambient temperature must not drop too quickly. It is also not food safe as consuming ABS is toxic.   The absolute beast in resistance is Nylon. It is durable both mechanically, as it bonds layers together very well, and chemically. Now comes the price increasement as 1kg of nylon costs around $30-$40. It is more flexible than ABS and absorbs humidity even more than PETG so it is incredibly essential to keep it dry. Printing with different colors of the same material is no probles as it has the same properties, but what if you could combine different materials? It is possible to combine PLA with tiny wood particles and it can create around 30% wood material called Woodfill. It has a nice warm, wooden feel to it and you can surprisingly use wood stains on it to give it more wooden look. Combining metal and plastic is also possible. You can find mixes of iron, aluminium, copper, bronze and many more with plastic. If a model made out of this material is a bit brushed, it creates amazing metal look. It can even corrode the same way to make the model look older! These special materials can cost $30 per kilo.   And finally, the last material I would like to mention is Flex material. As the name suggest, it is very flexible and feels like a rubber. It is also one of the hardest material to print and not every printer can handle it. It is the most expensive material on this list, because a 0.5kg spool costs $30. It can be used to print wheels or phone cases for example. And that's it! I know this article was a bit longer than the previous one, but there are many materials you can print out of and these only scratched the surface, the rabbit hole is much deeper. My questions for you are: Now that you know different properties of these materials, what are some unique cases where they could some of them be used? Is there other material you would like to see things made out of? Knowing there are so many materials, did it open your eyes about the uses of 3D printers a bit more?
324 votes
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Introducing Sly's Collection of Interests + Intro to 3D Printing

Hello Crowdholders, my name is Silvestr and I would like to use this platform to spread information about things I am interested in and hear your opinions. The first theme I would like to share is a very dear hobby of mine and that is 3D printing. I will create a few of articles about different aspects of 3D printing and hopefully convince to consider this technology. First of all, there are multiple of techniques to create a 3D object out of thin air. The most common 3D printers are based on FDM (Fused Deposition Modeling) technology, which is what this series of articles is going to be mostly focused on. In order to explain the basics, I need to bring some analogy. Imagine a regular (2D) printer. It works by moving a paper up and down on one axis (let's call it Y axis) and then moving the ink left and right (X axis). In layman's term, FDM works by melting almost wire-looking plastic, feeding it through a small nozzle and printing very thin vertical layers. The 'food' for FDM printers is called filament and the next article is going to be focused on all of the materials that filament can be made out of. A motor pushes filament through the heating block, which usually goes above 200°C, and then through a thin nozzle. The pushed material then gets deposited on the printing plate and the first layer of print is fairly similar to a regular printer. The printer moves the plate on Y axis and the nozzle on X axis. After finishing the layer, the nozzle raises a bit on third Z axis (hence the name 3D), by the value set as 'layer height'. Layer height can be as low as 0.05mm or as high as 0.6mm. I like to compare FDM printers to a simple glue gun. Glue gun works by melting a glue tube and then pushing it thought a thick nozzle. If someone was to motorize the movement of it, it would essentially be a 3D printer. FDM 3D printers are the cheapest with the price commonly ranging from $150 to $1000, but with the general unpredictibility of moving a molten plastic, there are other machines with better results. Potential dimensions of a model are however in tens of centimeters in every axis. Another school of 3D printers is called SLA (Stereolithography) printing. Its niche is in printing via hardening resin. To do that, the printing plate is submerged upside down in a liquid and a laser, or now more commonly used display, shines a UV light on parts that should be hardened. The plate then lifts a bit and display hardens another layer of resin. This allows for a much smoother final print, however, you are limited to the nature of resin - it is fairly fragile. After all of the layers are hardened, you have to leave the print overnight in a special liquid to cure the resin. Other cons of SLA printing are: Resin's smell when hardening is not very pleasant. Dimensions are often limited to 15 cm, usually in one axis, other axis are less then 10 cm. Price of printer starts at $400 and resin is not as cheap as FDM filament. The final 3D printing techique I'd like to talk about is CNC (Computer Numerical Control). CNC is more industrial, precise and expensive than any other techniques mentioned. It works vice versa than previous ones, where you created a model out of nothing. With CNC, you start with a raw material, be it a piece of wood or metal and drill it with various drills of variable smoothing options. You literally have a cube of raw material and create a model by cutting away more and more of it. CNC can be as big as needed (meters are possible) and the cost goes well into thousands of dollars. Questions for you, the community: Do you own a 3D printer? If yes, what is the most curious thing you have printed with it? If no, have you seen this technology? If you could create anything on the printer, what would you make? Do you have some questions about 3D printing you would like to get answered? Does this format of articles interests you? That's all from me today and tune in next week where I'll discuss the materials FDM filament can be made out of. Cheers, Silvestr
302 votes
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