Thank you gr5.
My goal is "to control stress direction". The material is carbon-fiber filament. I want to control fiber orientation. The only option to solve this problem is to divide section and apply different infill patterns. However, since the infill option is very limited, (eg : lines, concentric, etc). I can't design the tool-path as exactly what I want. I am currently looking for a slicer software to achieve custom infill pattern, tool-path. Any idea would be appreciated.