I am working with fusion 360 and a Creality Ender 5.
I have items that need to be bored and threaded. This does not work because once the wall layers are penetrated I enter the sparser Infill area which does not take the threads. I have improved results with a 100% Infill but I find that this infill does not really result in closely spaced runs of plastic (I don't know of any way to make and actual Solid item). Of course I don't want to use inserts for the screws.

Can someone tell me what I am doing wrong here? I thought that the generating software would make the screw holds with thicker walls but apparently not..

Thanks
Fritz