In 3D printing of 3D printing machine, each layer is constructed on the basis of the previous layer. Therefore, there needs to be a balance between the basic strength and the amount of consumables. If the foundation is not strong enough, there will be holes and gaps between layers. Especially in the corners where the size changes (for example, you print a 20mm square on a 40mm platform). When printing to a smaller size, you need to ensure that there is enough foundation to support the 20mm square side wall. There are usually several reasons for the weak foundation.