I came to this axi package to find out how you do your stroke font generation. I've installed axi and have tested some of the example scripts. One script that isn't working for me is pen_test.py. It seems to generate an out.png that shows pen test of a rapidograph 0.1mm. But nothing ever goes to the plotter and the script silently finishes.
(nambu) C:\Users\kanugu\code\axi\examples>python pen_test.py
(0.0, 0.0, 11.69, 2.9487756055115772)
(0.0, 0.0, 2.9487756055115777, 11.69)
the code that should plot it looks comparable to other examples I think
d.dump('out.axi')
d.render(bounds=axi.A3_BOUNDS).write_to_png('out.png')