Hi bojan
Your comments on the inkjet printing method are quite correct and I found that only some printers and inks were appropriate. I used an Epson C87. In particular, the ink needed to be the DuraBrite pigment-based type. Yes, I found that the yellow ink gave the best result. When baked it was quite a good resist.
I had to reset the ink cartridge chips to fool the printer into thinking that it had a full complement of the colour cartridges, when in fact I was using 4 yellow cartridges. So, I was able to obtain full coverage of the one colour at the print head. I found that if you chose any blend of the primary colours that it effected the ink viscosity and surface tension and the results were not as good due to pitting.
As you will see in the document, I moved the paper detector so that it was able to detect the laminate carrier.
To AndrewJ:
Yes, Andrew, I too used the positve photoresist method many times when I first started making PCBs at home. I used to print the layout onto transparency sheets on a laser printer and then UV-expose the laminate, then develop & etch. We also used a more formal process at my work place. It was quite a successful method. These days I have access to a PCB mill, so the days of chemical baths are long gone (thankfully). You just tranfer the Altium (Protel) file to the mill and press the button!
Cheers
John
