Hi,
Just thought Id mention practicaly any cheap laminator will work without any modification.
I use magazine paper taped with masking tape to a sheet of A4 and print the mask on a laser printer.
I passed it through about 6 times till the paper went slightly translucent.
Best magazine paper Ive found is "Linux user and developer" its a heavy high quality glossy magazine paper.
I found with the magazine paper and the laminator I got full transfer of the toner and realy crisp traces on my pcb.
Even good enough for double sided.
As the paper is thin you can lay it against a bright light and line up both sides of the mask and slip the pcb between them and the mask is accurately aligned.
I used it for this Sideuino - My Scratchpad
I couldnt get the toner to stick to the photo paper.
It smudged and stayed on the roller.
Gordon