PyCAM currently supports only rectangular processing bounds. This can cause unnecessary machine moves in unused corners of this rectangle. Additionally it makes it harder to use support bridges, since they need to be connected with the remaining material outside of the bounding box. See the screenshot for an example of three objects that are supposed to be cutted out of a solid block.
The new toolpath cropping feature (currently only available in the development repository – to be released with v0.4.1) allows you to crop the toolpath to the required minimum. This can reduce machine time significantly. Read more »