I been printing transparencies on my Tektronix Phaser 740 without much troubles. To achieve darker blacks I would put one transparency on top of the other. So far so good.
But I didn't like the idea of printing twice for one image. So I decide to include a toner aid from silkscreeningsupplies among other things I ordered.
I sprayed the toner aid on the transparency, let it dry, and printed. First print came out just as if I didn't use it at all. Went to print the second image.
This time a spot (stain) appeared on the transparency. Tried printing many regular papers, same results.
It seem in some way the toner aid got in the drum or somewhere in the path of the paper an stained it. Every time a paper pass through it will come out stained (spotted ?)
The thing is , now I am without my laser printer, which has been working just fine.
I removed the drum unit, cleaned it up, nothing.
Clean every place accessible by the user, and nothing seems to fix it, or clean it. Now it is printing badly. And badly means .. image has clear spots where it is supposed to be black, a continuous line will show gaps all along, !
I was just starting my second BIG (50 t-shirts) order
.
I tried (after gave up with the laser one) with my Epson 2200, but it print a little bit smaller than I would like. Also it prints a translucent black.
Then tried with my older B&W Samsung laser, same thing, black is not black enough and quality is not nearly comparable to my color laser.
I had to use an C88+ still in the box, unopened, and it will handle the exact size I need, and stacking one on top of the other it is black enough.
It seems to me so unfair
my color laser was working just ok... and after adding toner aid to the paper I screwed it up.
I saw someone in craigslist in my area was selling an Oki 55000 (I guess it may be 5500) $100. Any opinion?
It sucks
.
Thank you
Toner aid.. no thanks 
