Concrete sphere mold
cults3d
This concrete ball mold has a diameter of 16 cm. for a larger diameter you will have to scale it. you have to calculate the amount of concrete you put in the sphere so that you get 1 cm think walls. after inserting the concrete put the plug in the hole and turn it left or right to lock it and turn the sphere in all directions until the concrete dissipates evenly on all the walls. you let it harden for a few days and the you open the mold and mill the concrete according to the shape you want to get the hole through which you will put the soil and plants in the pots
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