About This File
This is a much sought after model of the Dome lenses for the 70's Day of the Daleks - Genesis of the Daleks Wipac lenses, intended to be printed at 100% to have the 69.9mm diameter. You can download the model and remove one instance to print one at a time, I have checked this model on Shapeways and it appears to pass all their tests, n.b. if using shapeways use the Print it anyway option