Is it possible/practical to use a heat gun instead of an iron to transfer toner when making your own PCBs? Can you get a uniform heat pattern without for a small board? Is enough heat applied from the heat gun to actually transfer the toner?
From my experience with iron-based toner transfer you really need to apply lots of pressure to get the toner to transfer properly. I tried lots of different techniques (>10 tries) before finding the correct paper, correct/sufficient pressure across the board was important.
I suggest you try with an iron first and then move on to heat guns. I'm interested in your findings.
This is just a crazy idea I got, but...
Build your own little contraption consisting of two sheet of metal, say aluminum, and drill 4 wholes in the corners. Add some nuts and bolts through said wholes to apply pressure, and lastly apply heat. This could be with a big-ass heat gun, or even a (domestic) oven.
Report back with the results if you try it. :)