4. Once you've made the back fold, do the same for the front. We bent this completely back on itself to make a comfortable fold if we rest it on our legs.

5. That could be it right there, but we're going to add extra cooling. Flip the laptop over and mark out where the cooling vents are. Make sure you drill/cut slowly otherwise you'll crack the plastic.

6. Take an existing USB cable and strip a off suitable length.

7. Choose a low-power fan as it'll only be supplied with 5v of power from your laptop's USB port (rather than the 12v our fan says it needs). Solder the black and red connections together.

8. To make a neat finish, counter sink screw holes in the plastic, so the fan screws will be flush.

9. Our final touch is to add a strip of silicon rubber to stop the laptop from slipping. Alternatively, you could use rubber pads.