In 2008, my four-year-old laptop gradually gave up the ghost. A number of things went wrong with it and a corresponding (actually slightly smaller) number of its parts had to be replaced.
One of its problems was overheating. The logical solution was to build a cooling system for it.
I didn't want to block the airflow to the computer's already overloaded fans, so I made series of customised aluminium and copper water tanks to fit underneath the laptop while leaving its fans unobstructed.This is actually a smaller, healthier laptop being used as a demo model. Water is pumped up the pipe on the right and allowed to trickle over a series of aluminium cones on the left before recirculating underneath the computer.
The cooling system was eminently practical and portable to suit my hectic urban lifestyle.