Hi Andrew,

Fidling around with trial and error, I have managed to find some causes, but not all.

There are some issues here:
- Radius correction (inside / outside) is used for line fonts. Inside / outside only makes sense for closed profiles.
- The line fonts that come with QCAD were originally made for screen display and are not precise enough for effective CAM processing. This will be adjusted in a future version, possibly the next version.

Unfortunately the toolpath error is not fixed.

More likely I think there is a issue here.

Probably still an issue