Castable refractory mold

Designed in Fusion 360. Three of these mounted together is a 3-piece mold for castable refractory. This is intended for the corner pieces between the fire brick in a 6-sided kiln. Adding corner pieces (rather than chamfering the edges of the firebrick) drastically increases the cross-sectional area of the kiln. Designed around 2.5x4.5x9" 2600*F firebrick.