This is one of the systems major advantages, because, in principle, a model could be built in any fusible powdered material. Currently the range of materials includes nylon, glass filled nylon, polycarbonate, wax and metals. The laser scans each slice fusing the powder, to the previous layer. As with all of the techniques mentioned so far the model is built on a table which lowers after completion of each slice. A fresh layer of powder of the required thickness is then rolled across the top of the cylinder and the process is repeated.
Excess powder remains in place around the model to act as a support during the build.
On completion of the build the excess powder is brushed from the surface of the model. It is made in eight parts using the techniques described in this article. All that has been done since delivery from the Rapid prototyping unit is the addition of some final filleting, not possible with our level of CAD, light rubbing down and a coat of pattern varnish applied. 2.3.1 EOS Sand Sintering Photograph 1. 700 Direct Croning System One of the biggest steps forward for casting has occurred with this technology.