MDF – dimensions depend on the size of the voronoi screen
Polyester resin – amount depends on the size of the screen
3 axis CNC
Rhino, this is a computer modelling software, a trail version can be downloaded at http://download.rhino3d.com/rhino/4.0/evaluation/download/
Grasshopper – this is a free parametric modelling plug-in for rhino this can be downloaded at http://download.rhino3d.com/Grasshopper/1.0/wip/download/
When the definition is ‘baked’ it produces a screen with cell depths that only have the same depth. In order to produce varying depths multiple planes are produced at varying heights between the screen depths. The planes are the Boolean intersected with the voronoi cells.
Save the final rhino model as a 3ds file.
The 3ds file can then be loaded into the interface of the cnc machines software, stages are then carried out in the software for the cnc machine to physically produce the 3d voronoi model. Note a 3 axis cnc machine can only move a parallel directions with regards to the x,y and z axis, it cannot machine a 3d from that goes back on itself.
This screen used a 6 mm ball nose drill bit, this produces a very fine finish to the material.
This voronoi screen used 200ml of polyester resin which requires 50 drops of a resin catalyst to set the resin. This ratio should be further detailed in any resin casting kit found at any good art store. The polyester resin is opaque, a 10ml of a glass lacuer colour agent was added to produce an orange colour, various glass lacuer colours can be used. Depending on the amount of resin used effects the setting time of the resin, in this case it took 40mins to completely set. Note the resin gets hot when setting so cast onto a heat resistant surface as it can deform thin plastics. Resin casting should also be carried out in a very well ventilated space.