Piece made with lost foam or policast casting using a foam model made with my MPCNC:
The model was milled in two phases to make the front and the back:
On the rear face there is a riser that also serves as a downsprue.
After the casting the two rear structures were manually removed:
A second attempt was made using only one riser on the rear face:
The cavity inside the riser is clearly visible:
In this case the foam model was covered with quartz paint and this allowed to obtain a better surface on the piece:
