These images show two designs for a basic two-part plaster mould. One being of a traditional vase shape and the over being a cylinder rounded at the bottom.
Both of these designs was made in the same way. I first created a solid shape. I then place boxes around the object in areas of which will remove without undercuts. Then through boolean difference, I am able to subject the object from the boxes. creating a hollow opening for slip to pour into. I then produce spheres that act as the notches, alinging the mould.
Once they was CNC machined, I found that my notches didnt fit to I had to alter them smaller. This led to my mould not aligning great and giving me a line, which I cant remove due to the ridges. I have been told that maybe making the object and making the mould by hand. This will help in making my objects to a larger size and may help with the line around the outside… although I want to test as I may loose detail and the crisp finish lines.