Very cool! Works well.
The calibration didn't align the front and back 100%, but it probably has to do with the printer rather than the design. I just had to cut the edge a little closer. All this did was uncenter the Bitcoin symbol over the private key, although it was entirely visible. I used Zoom: 3, Shift: 7 if that helps anybody else.
Any chance there will be an option to specify the size? Would that mess up the Zoom/Shift settings? I think it would be cool to have it the same size as paper currency, but I suppose paper currency has different sizes throughout the world.
Great stuff
