Wearable technology is being massively touted as the future for communication, entertainment and personal computing and, certainly, that would seem to follow all recent trends. Since the 1980s, technology has become smaller and smaller and, so, the idea of having all your contacts and communication ability stuck to your body is an obvious next move. Whether it be Google Glasses, the Pebble or the Smart Shirt, all of these items will need to share a number of common principles if they are to be a success and understanding these will be key to understanding this hardware trend.

They all solve a recurring problem

Basically, wearable technology has to be useful. Nobody wants a piece of technology weighing down their wrist or wrapped around their face unless there is a good reason for it. Practicality is everything.

Does not take the wearer out of the world

Many people's first reactions to Google Glasses was appalled shock, with the assumption that any wearer would, essentially, be living inside a computer, never actually interacting with the world around them. In reality, for wearable technology to be a success, it needs to help the wearer interact with the world as opposed to distracting them from it.

Focus on the person

Any truly popular wearable technology will have to be human-centric, not machine-focused. Rather than hardware companies taking a piece of technology and thinking ‘how can we get people to use this?' it must begin with a human requirement that makes researchers think ‘how can technology address this?'

Solve more problems than it creates

Of course, there are going to be some issues with wearable technologies. Google Glasses poses the obvious one: does anybody with perfect vision really want to wear glasses? The answer is only positive if the glasses bring more advantages to the table than disadvantages.

Take advantage of existing behaviour

What it will all come down to is how much these devices feel like natural extensions of normal human behaviour as opposed to catalysts for new behaviour. In reality, they should not change the wearer's behaviour much at all, just make doing the things they already do either easier or more enjoyable.

3D printing has never been far from the tech headlines this year. If you want to get involved with the additive manufacturing revolution, you will have to learn a few things about the process. One of the most important things to understand is the difference between different types of filament.

This is the material that runs through the nozzle and forms the object on the building platform below. The consumer level machines generally specialise in two types of filaments: ABS and PLA. Both of these materials have their own advantages and disadvantages and are suited to different things and knowing about this will be crucial to getting your 3D objects printed properly.

ABS

Also known as Acrylonitrile Butadiene Styrene, ABS is a petroleum based material that is perfect for durable, tough objects. The cheaper of the two filaments, its flame resistant toughness makes it a great choice for protective clothing, pipes, appliances and car or machine parts. Objects can be sanded down post print, so getting a nice smooth finish is possible.

ABS does, however, come with certain issues. First off, it doesn't smell great while being extruded so you will need a well ventilated area to work in. It's toxic too, so can't used for any kind of food container. It doesn't biodegrade either, though certain machines are being developed that might allow you to recycle old ABS objects.

PLA

Polylactic Acid or PLA is made from corn starch, sugar cane, tapioca roots and potato starch. This means it comes with a pleasant smell, biodegrades and can be used for food packaging or utensils. Yet it is also somewhat brittle when cooled and takes a long period of time to cool down.

This means using it for machine components that will be put under a heavy amount of pressure or in a high temperature is not really possible. Also, sanding it down post printing is not really possible.

It is, however, good for medical implants as it degrades eventually within the body. Disposable clothing or any hygiene related products is also printable with PLA.