Random lines on a object

[Brandon1]

I’ve created a model and there are some lines that I guess have appeared when extruding parts of the walls, there minor but are throwing off the 3D print and hitting the delete key on them don’t remove them.

[PEC]

Hi,

have you tried replace face ? The lines suggest that the faces are not parallel or not at the same height.

[Brandon1]

Thankyou, this has worked.