Hello gr5,
I believe this was created with solidworks, I received a sldprt file and used edrawings to export it to stl. The walls should be much thicker (I would like something around 0.8 to 1.0). I tried to make the walls thicker within Cura but that made no difference. I will definitely try netfabb and see if it fixes the issue, otherwise I will open it in another cad program and try to thicken the walls before exporting it.
I appreciate you taking the time to respond and I will post how the repair goes.