Cura automatically filling in circles???

[vorcette 0]

Hello!

I am brand new to 3d printing (for like 4 months) and I have just ran into a issue searching the web doesn't seem to help me with. I imported a cylinder, 9mm wide, with a 6mm hole down the middle of it, that is 25mm tall. I have 20% infill and .2mm height. Randomly, on the last 3 layers, the whole top of the circle automatically gets filled in, not making it a hollow sphere, but a hollow sphere with a closed top. how do I fix this?

Thanks so much!!!!

[peggyb 171]

first advice: look at the xray view for red areas, there is probably something wrong with your cad model.