For the Cover and Base parts (largest parts in PLA) Use large brim (20mm or so) to minimize warping Use at least 3 shell and top/bottom layers Use 35% infill 0.2mm layer works well For Hinges and other small parts (in ABS) High density infill (30~50%) is recommended Use at least 2 shell and top/bottom layers 0.1mm layer gives a nice finish