Iphone 13 case that should be printed with solid materials like PETG or PLA. I recommend PETG as it provides just a bit of flex to the case which can help with getting it on and off.  PLA will work just fine just be careful when taking it on and off your phone, and also try to not use a really bridle PLA like polyterra. Also if you are using a smooth PEI sheet you should apply a layer of glue stick in the print area. There are pre-sliced gcodes for both PETG and PLA, I recommend you use them. Please like and upload your makes!