This is my first printing project, a simple umbrella holder that can be mounted from one side. It consists of 2 parts, whereby the lower one only has one more edge so that the pole cannot slip through. The model is designed for a 40x40mm square railing and is suitable for a pole with a diameter of 25mm. You need 3xM5 nuts and 3xM5 Allen screws with a length of 20-30mm.