Warping Stable Porous Uniform grain structure. Quality of finish Tool wear Expansion. Consider… › Initial investment › Training › Working environment › Flexibility › Communication › Wastage. Repeatable quality and a reduction in the amount of tolerance. Modelling wax, high-density foam, manufactured board and card. Consider health and safety, tooling, feed speed and surface finish. Modelling wax can be machined by CNC and then used to produce a master for lost wax casting. Consider feed speed, depth of cut, coolant and tooling. Changes of colour and texture give a better aesthetic view of what a product may look like.