Creality print cannot render the part i show in the 2nd picture. Although I set the “sparse infill density” to 100%, I cannot print the part i show in the 2nd picture. I divided the part into 2 by selecting “indicate” with the “split” function, I tried to make the curved lower part 100% infill and the long upper part 8% infill, but again I got no result. What would be your suggestion?
Hello @tevfikcete …! 
Welcome to the Creality Forum…! 
What happens…?
Does the program freeze…??
Will it print at any settings…?
Try the default ones.