can't convert to single line or hairline for engraving purposes

[ungaaaabungaaa]

[chavenor]

Try changing the stroke size to 1. stroke_widths = [1]

[chavenor]

Or even 0.1

[Fardenco]

For anyone wondering how to do that, in fact you don't have to do anything. You've been mistaken by the web demo, that outputs a variable width line to replicate the effect of varying pressure we apply on the pen when writing. But the code from this repo does not do that, it outputs a single line that you absolutely can use for engraving or drawing with an axidraw for example.