Success! I got the toner to transfer cleanly! I tried again with the same temperature in my oven (about 190-200 degrees C), but only leaving it in the oven for five minutes. The first attempt here transferred the center portion very nicely, but the edges totally fell apart.
Two things came to my mind. First, I did not apply as much pressure as the previous attempt. Next, I also forgot to degrease it. I then tried again, this time having a much tighter grip on the clamp in addition to degreasing the brass.
It came out pretty good this time!
The thickness of the lines however did expand. It comes as no surprise given that we are pressing down on them, and that they'd spread.
The transfer's lines are very crisp though, and all of the toner was transferred across.
Two other things need to be done though, and that the resist should actually be printed in reverse... I want the areas in black to be etched in, so I bungled that. And I would also like the maple leaf to be on the right. I'll keep that in mind for the next attempt, this test should be good enough to begin some actual etching!
Edit: Aaaaand I've got a version with the reversed and flipped image. It's all good! The tears at the edge are simply caused by the metal not being flat. I used a pair of shears to cut the metal, and this was what caused the warping. Gotta see how I can cut metal without the warpage - maybe a jewellery saw?
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