Sunday, 18 June 2017

Accessible SLS 3D printing // Formlabs Fuse 1

Formlabs Fuse 1
When 3D printing is mentioned, we almost always think of the standard FDM or Fused Deposit Modelling because the printers becoming cheaper and easier to function are using this technology. It works by melting thin, round plastic called filament and laying it down on a build plate to produce a single layer of a 3D object.This is process is repeated again and again until a 3D object is formed. However, this is one of many 3D printing methods with others consisting of SLA, DLP, ELM, BJ and then SLS or Selective Laser Sintering. Earlier this month, Formlabs the company behind the Form SLA 3D printer series, released a new product. The Formlabs Fuse 1 which is a a SLS 3D printer. This is a significant technological advancement because the technology has not been accessible to small businesses and manufactures for a reasonable price. 

SLS 3D printing works on the Fuse 1 like this: Tiny nylon spheres are equally laid across a bed and then the machine heats them up to just below their melting point. Next, a laser runs across the powder and fuses certain nylon beads together to produce a particular cross section of your desired 3D object. The bed with the cured nylon on then lowers by a couple of millimetres and new powder is spread over the previous layer. the process is then repeated until the print is complete! When the part is complete, you can clean off the powder that as not been cured and you are consequently left with you hard, nylon part.  The Fuse 1 has a 165 x 165 x 320mm build volume, big enough for most applications!

The three main advantages of SLS printing are the short print times, the ability to print with no supports and the strength of the prints. Strength means you have a large range of applications in manufacture and product prototyping. Printing in powder means you can print parts with severe overhangs, mechanical/moving parts at once and lots of parts at once for example 12 individual bike pedals on top of each other or moving chain mail in one print (pictured). Sound good? You can have on for £12,000 when the queue is short enough!     

Saturday, 17 June 2017

Battle of the Boards

Battle of the Boards


If you have ever seen or made any project that involves an amount of electronics or logic and you are interested in maker community, almost certainly you will have heard of the words 'Ardunio', 'Raspberry Pi' or possibly even 'Micro bit'. These names are associated with the popular development boards that rule the D-I-Y project empire. The problem is choosing the right one for your application as they may all be strong contenders. So in this guide I aim to give you an idea about the similarities, differences, strengths and weaknesses of these tiny boards.


Firstly, what is the difference between a micro computer (Raspberry Pi) and a micro controller (Ardunio, BBC Microbit) A micro computer has an desktop interface and OS (operating system) that you can access by plugging it into a monitor or a television. A micro controller has no interface, you write a program on a computer and upload just the code to the board with the IDE (Integrated Development Environment). It is able to store and run only one program at a time, but can be programmed again and again.



The Ardunio
The popular Ardunio Uno
The Ardunio is one of the most popular development boards around. Produced in Italy, the first board was introduced in 2005 and was designed to help students who had no previous experience in electronics or micro controller programming to create working prototypes, connecting the physical world to the digital world. You program the Ardunio in the free IDE which you install to your desktop on your normal OS. The IDE requires C++/C code which may be daunting for some yet you can find various pre-written sketches. The board features header pins with a variety of functions for interfacing with different sensors and actuators at once. The Ardunio has a great community around it. Cost - £18 or $23.
The Raspberry Pi 2



The Raspberry Pi

The Raspberry Pi is a popular microcomputer produced in the UK by The Raspberry Pi foundation that runs a version Linux. The board was released in 2012 there have been various models since then including the Pi 2, Pi 3, Zero and more. The boards feature a HDMI output for connecting with a monitor or TV as well as several USB ports that you can connect peripherals to like a keyboard or mouse which means the Raspberry Pi can be used a small desktop! Furthermore, the official programming language of the raspberry pi is Python which is easy to learn than the Ardunio's C++/C languages deeming it easier create custom programs than the Ardunio. You can also use scratch GPIO edition for programming.




The BBC Microbit
The tiny BBC Microbit
The BBC Microbit is a tiny microcontroller that the BBC released last year to every year 7 student in the UK to increase the popularity of Computer Science within schools and encourage children to learn programming. The board is now available to the general public for £13 or $18. The board features a simple 5x5 LED matrix, five connection points for components (e.g temperature lights or buzzers), a compass, an accelerometer, a power connector and more. You can program the board in a block editor, python or JavaScript, making it the most basic board of the three. You upload the code to the board via the supplied micro USB cable. If you require lots of external sensors for our project it will be hard to do with the Microbit yet the board is a great resource to have and certainly perfect for beginners as of it's simplicity yet powerful capabilities for a range of creative projects.  

Find out more at:

Ardunio
Raspberry Pi
BBC Microbit 

Anet A8 Review // Best Cheap 3D printer

Anet A8 Review
Anet A8 3D printer from Gearbest
The Anet A8 from GearBest is an affordable, D-I-Y 3D printer that retails for around $150 or £130 and is a great printer for anybody interested in desktop 3D printing, yet is on a tight budget. It features a heated build plate,  a 220 x 220 x240mm printing volume, and is capable of printing with materials such as PLA/ABS/Nylon/PVA/Wood compounds . The design of the printer is sturdy and the black acrylic frame feels and looks high quality. The same can be said for the electronic hardware, high quality components, built to last. 

The printer arrives in pieces yet is easy to assemble and takes around 4-5 hours to complete with the included tools (screwdriver, zip ties, spanner and side cutters). Once completed you run some configuration and level the bed, making sure the bed is close enough, then run some test prints supplied on the 8GB SD card . It comes with a small amount of a random coloured PLA filament, I received red. 

Loading the printer with the  file is easy. You take the SD card and plug it into you computer where, using a slicer e.g Cura, you save

your  G-codd file onto it. Although this sounds complicated it is all done by Cura under the covers and leaves only the printers settings down to you. You can then push the card into the A8's mother/controller board and access it through the clear, easy to read, blue LCD screen. 

The printer features a direct drive extruder and requires you to push the filament through a small hole in the top of the assembly until oozing out of the nozzle. However, my first negative is how hard it is to load filament and I have to normally end up taking the fan off to access the throat or you have to move the filament around and guess where the extruder is positioned. But you shouldn't need to do this too frequently so nothing overly major. 

The prints produced by my printer so far have been high quality when printing designs I have created in CAD and files off websites like myminifactory and Thingiverse. The printer comes with a 0.4mm which produces nice result yet this can be improved with a 0.2mm or 0.3mm nozzle (available at the shop). As well as this, I recommend replacing the masking tape that comes with the printer for blue professional masking tape that can be found at most home improvement stores.

Overall, the Anet A8 is a great beginners 3D printer for an astounding price. It is designed and built well and features high quality parts such as an bright LCD, powerful stepper motors and accurate temperature controlled heated bed .I was surprised at how no extra tools, zip ties or screws where needed to assemble the machine as normally the kits require slight modification to function appropriately. The printer is capable of printing ABS yet it will require an enclosure to retain the heat which covers the basic materials. However, the Anet A8 will require you to have a basic understanding of electronics in order for you to fix any issues that occur (not that you will encounter many!) 
Buy the printer here from Gearbest!

Pros
  • cheap yet high quality.
  • easy to use (software/hardware).
  • Aesthetically pleasing.
  • high accuracy.
Cons 
  • poorly written instructions.
  • unreliable at times.
  • mains voltage exposed.
  • Buttons not responsive and screen hard to navigate.