> To maintain relevency of discussion let me point out few topics for discussion:
> 1. Paper used for Toner Transfer
> 2. Laser printer type.
> 3. time and temp. required for exposure ( imp)
> 4. Single sided and Double sided PCB designing.
> 5. CHEMICAL composition and eatching time.
> etc..
>
I've used this technique for occasional PCBs for several years now and have gradually refined it so that I can get pretty good quality boards without too much effort. I've had good luck with the Staples inkjet photo paper I've seen recommended but I find that cheap glossy junkmail paper works just as well if you can get it to feed through the printer without jamming. My current printer is a Xerox Phaser 6100 and it provides good results, although I've not tried very many different printers. I turn the iron on high, preheat the blank board for a few seconds, lay the pattern on it, place a piece of blank paper over and then hold the iron on it, moving continuously and applying moderate pressure. Some experimentation may be needed here, if you don't press enough the toner may not bond to the copper, but if you press too hard it will squish and smear. I recently ordered a cheap laminator which I hope I can modify to pass PCBs through and get more consistent results. Give it plenty of soak time in warm soapy water and scrub it with a stiff bristle toothbrush to get all the paper residue off areas you want to etch. Properly applied toner sticks surprisingly well so don't be afraid to scrub at it.
The nice thing about this technique is that if it doesn't come out right you can just scrub off the toner and try again. The price is hard to beat too assuming you have a suitable laser printer.