Tasks and News

Introducing Sly's Collection of Interests + Intro to 3D Printing | Posted 8 months ago
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
Project: Sly's Collection of Interests | Rewards: 2000 YUP
The Future of Currency. Corporates vs. Governments: Will we end up picking sides? | Posted 5 months, 2 weeks ago
Howdy Crowdholders, After reviewing the voting and reading some fascinating comments from the Libra WP task, we see truly a double edge sword. It’s clearly up in the air whether this will be positive or negative for the future of Crypto. Capitalism is all about competition. You may recall the episode in South Park “Something Wall-mart This Way Comes, where at the end the town burns down Walmart, vowing to spend at their local hardware store. Then it fast forwards and the local store becomes a corporate giant from all the town's spending. They then repeat and burn it down again.       You can ask any startup if they would like to become a Unicorn (corporate giant), they usually all say, “Yes!” So whether FB becomes a winner or other Crypto projects become the most successful crypto business, the outcome will be the same. In a way we have to accept this, as “burning one business down opens up another business to take its place.” Some say, the free market brings more power to the business world, which has given rise to less competition (mergers and acquisitions gone wild!). And a call for Government regulations to restrict the current market. While the other side says that restricting the free market, restricts the low barrier of entry for any person to start their own business. This would then increase costs and prices for a competitive market, allowing only large business to be able to survive bureaucratic red tape.    Let's now look at some recent news coming from China. As per  Bloomberg, China is on the horizon to release their own centralized blockchain Cryptocurrency, which clearly shows this Crypto play is about restricting freedom, not increasing it, as a new digitized cash can be tracked. Some can also claim FB is also restricting freedom as well, with only a promise that in 5 years they will fully decentralize their system. But from looking at China’s actions, it could unleash a wave of more Governments playing a similar game. But there is some hope, which comes from the economists, Friedrich Hayek.     In his 1976 book Denationalization of Money, his vision of an ideal monetary policy for currencies would come from private businesses issuing their own, and compete with each other for public acceptance. In fact, his ideologies now can be seen in today's Crypto market. The stability of the currency, would create the most trust through a mutually acceptable intersection between depreciation and appreciation. He even goes on in a reversion of the book, that it would then bring the survival of the fittest for the global best monetary policies… Bitcoin anyone? As you can see this is eerily similar to what is happening in the Crypto market we are in today.     The future looks to be a competitive one. One that may see a rise in power between public vs private. It’s going to be bumpy. But one thing we all agree from what we have seen from history, restricting freedoms both economically or socially brings forward oppression.   This task is about us all sharing our knowledge and distinguishing the world ahead. Are we looking into a future where we pick sides?    Look forward to your thoughts!   
Project: Crowdholding | Rewards: 10000 YUP