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Inexpensive & abunduntly available thermal transfer sheet for making PC boards

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SilverSolder:

--- Quote from: KL27x on April 17, 2019, 12:22:17 am ---I used to have this problem, as do many others. But no more.

--- End quote ---

So, if you print e.g. a black filled rectangle the size of an A4 (US letter) page, you would expect it to give a thick (enough) and even coating to be able to protect the copper?

None of the devices I have tried slathers toner on thick enough to make that possible.

David Cutcher CEG:
Interesting thought. Never had need to do a whole sheet entirely covered. But I have done larger negative areas just to save chemicals. There are always pinholes. This is a method for home, education, and prototyping.  I'm not expecting commercial quality.
For classroom work, I use A4 sheets printed with multiple pcbs within the margins. And a T-Shirt press. I get consistently great results. It's a matter of practice. And don't use the "Save Toner" settings on the printer.


SilverSolder:
I also get excellent results as long as I don't use large fill areas. 

Printers and copiers definitely put a thicker layer down when there is less area to cover.  Wonder if there is some power limit in generating the static electricity for the roll fast enough, or something like that, when you are printing large areas?

KL27x:

--- Quote ---So, if you print e.g. a black filled rectangle the size of an A4 (US letter) page, you would expect it to give a thick (enough) and even coating to be able to protect the copper?

None of the devices I have tried slathers toner on thick enough to make that possible.

--- End quote ---

Hmm. I have never tried to print a solid polylgon that large, so I can't answer that... yet. I might have to make a board very soon, so I might give that a try.


--- Quote ---Wonder if there is some power limit in generating the static electricity for the roll fast enough, or something like that, when you are printing large areas?
--- End quote ---
+1. I'm gonna be curious to find out. I'm working on a prototype right now, and if it ends up suitable for DIY, I plan to make it, myself. I'll try this, too. Maybe not an entire A4 envelope, though. 3"x5"?


--- Quote ---Hey KL27x
This is very easy to do. This is my 1st post, so I hope the attachment attaches.
This is a scan from my book "Electronic Circuits for the Evil Genius" 2nd Ed 2010.
It's all about clay coated paper. That's why magazine paper works. But the Epson Photo Quality ink jet paper is the best, for the price.
David Cutcher "Certified Evil Genius)
--- End quote ---
I think I've read some of these books, mate. Cheers. I actually went over to the internet store, found this Epson S041062 and put it in my cart...

And then I get the notification that I purchased this stuff ten years ago. It didn't work for me, then. Although I probably did not try the dish soap trick. Clay coated magazine paper worked pretty good for me. IIRC, this "clay-coated" inkjet photo paper stuck to the board even where there was no toner. Maybe they changed the formula (or maybe they sell a different product in Canada), or maybe I was doing something wrong/different. That was so long ago, I'm not sure if I was still trying to use an iron or if I had a laminator.

SilverSolder:

--- Quote from: KL27x on April 17, 2019, 05:51:02 pm ---I'm working on a prototype right now, and if it ends up suitable for DIY, I plan to make it, myself. I'll try this, too. Maybe not an entire A4 envelope, though. 3"x5"?

--- End quote ---

It is pretty obvious on my printer that it considers it a challenge to print a big black rectangle even on plain paper. You don't need to go as far as to actually try to etch a PCB if your printer is anything like mine.  It is much, much happier with line art, even reasonably thick lines.

Would be interesting to try a few experiments to see how many % of a page can be black, and still provide solid toner coating...

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