In the last months I was heavily playing with PCB (Printed Circuit Board) design, etching and things related to this.
I wanted to see what is possible with simple tools and how good results can get.
With just normal copy paper (80 g/m^2) and a halogen construction lamp it is possible to produce structures of around 10 mil!
Which makes it possible to edge PCBs for SMD microprocessors and much more.
All equipment needed costs less then 40 euro, and some should be already at home.
A more detailed description how I do things can be found under the link: