The results from visual assessment are represented as a color matrix in the SI file, Fig. . For a laser power less than 10% (i.e. < 4 W) within tested speeds, LIG formation was incomplete on the PI foil for tested speeds. On the other hand, for high laser powers (>14%) or low laser speeds, LIG delamination or burnout formation was observable. No pretreatment was applied to PI sheets, before the lasing process.