h taper away from an upper proximal end 110 towards a lower distal end 111 such that the gap 112 is provided between main bodies 106 of adjacent supports 105 the taper allows the main body 106 a to 106 h to pivot about a point close to the object when the main body 106 is displaced into the gap 112 the length and rigidity of the main bodies 106 b to 106 e is such that an input force can be applied to the distal end 111 to displace the main body 106 into the gap 112 such that a resultant force on each of the frangible structures 107 is greater than the input force in this embodiment the throw may be between 5 to 30 degrees a top of each main body 106 follows a contour of the object 2 to provide a set gap between the main body and the object that is spanned by the frangible structures 107 in this embodiment the frangible structures 107 comprise a grid that can be broken on application of a force to the main body 106 a to 106 h the grid has a height of 0 3 mm the distance d between parallel walls of the grid structure is between 0 4 and 0 8 mm it has been found that for metal objects such a steel objects a width of 0 4 mm ensures that the walls are built as separate elements typically a diameter of a melt pool generated in an slm process will be approximately 0 2 mm so a distance of 0 4 mm ensures that the melt pools.