3D workshop- slump/hump mold.

Hump/slump molds help with creating multiple bowls all the same size.

The process:

To create a slump mold you get a lump of terracotta clay and shape it into the desired format you would like your bowls to look like. You place this lump of clay onto a wooden board and using more clay you place a piece of lino around this board making sure it is attached securely to prevent leaks. Mix up some plaster, the amount depends of the size of the piece of clay. Pour this plaster over your mold and leave to dry for roughly 30 minutes. 

When the plaster is dry you remove the lino from around the outside and turn it up the right way. You then remove the clay for the mold so you are left with empty mold.


When working with clay you have to consider 'COSHH' which is control of substances hazardous to health. The main hazard when working with clay is crystalline silica which is dust. Breathing in to much of this can cause silicosis which is a disease of the lungs. The hazards of this can be minimized by;

• Wearing a mask.
• Keeping exposure as low as possible by working away from others, using slurry bins, covering tables when working and washing surfaces, tools and equipment.
• Having a well ventilated room.

This is the form used to create the mould.

It is then placed onto a board with lino around ready for the plaster. 

This is the piece when the plaster is poured over the form.

This is the piece when the plaster has dried and lino is removed.