Even though this kiln looks large it doesn’t hold all that much. I can get 3 levels that are 18 cm. high per step in the kiln. On one level I can fit about 40-50 pieces. I then have the top level onto which I can fit more. I have 6 levels so 6 * 150 = 900 pieces not counting the top level of shelves for any step. 1,000-1,100 pieces. I thought it held thousands and thousands.