About this 3D model

I have made a simple spoolholder for the ultimaker that can hold a spool with a diameter of 25mm to 57 mm. It replaces the original spoolholder at the back. I was inspired by: http://www.thingiverse.com/thing:106867 You will need: 4 ballbearings size: diameter: 19mm height: 6mm Hole: 6mm 1 axe M6 3 Nuts M6