Hi, I am trying out ideas for using Laser prints to transfer image to PCBs which is resist and allows etching the circuit. Here is a small circuit, attached, showing a successful test. This is approximately 20x40mm. You can see the top 2mm aluminium plate has a sheet of silicon, which spreads the load, then yellow transfer paper, then the printed circuit, then the bottom plate. This sandwich goes into an old toaster for 1min.20Secs. More time anneals the Ali, less time is not enough, to soften the print. This is about the largest PCB possible when enough pressure can be applied, before bending the Ali. I want to scale up to take a 4"x6" PCB, so obviously the plates must be stiffer. so far, my idea is to get 5-6mm and end-mill holes making a honeycomb pattern. does this sound feasible? Cheers, Camerart.