Cardboard is a generic term for a heavy-duty paper of various strengths, ranging from a simple arrangement of a single thick sheet of paper to complex configurations featuring multiple corrugated and uncorrugated layers.
Glass is an amorphous (non-crystalline) solid material. Glasses are typically brittle and optically transparent. Glass, as a substance, plays an essential role in science and industry. Its chemical, physical, and in particular optical properties make it suitable for applications such as flat glass, container glass, optics and optoelectronics material, laboratory equipment, thermal insulator (glass wool), reinforcement materials (glass-reinforced plastic, glass fiber reinforced concrete), and glass art (art glass, studio glass).
https://de.wikipedia.org/wiki/MetalleIn 3D printing, ABS or PLA is usually used as the base material, to which a mixture of metal powder (copper, stainless steel, iron, bronze or brass) has been added. The squeezed out objects look and feel like metal.
Wood is generally used to describe the solid or hard tissue of the stems (trunk, branches and twigs) of trees and shrubs. Botanically, wood is defined as the secondary xylem of seed plants produced by cambium. According to this definition, however, the woody tissues of palm trees and other higher plants are not wood in the narrower sense. However, the storage of lignin in the cell wall is also characteristic here. In a broader definition, wood is therefore also understood as lignified plant tissue. From a cultural-historical point of view, woody plants are probably among the oldest used plants. As a versatile, but especially renewable raw material, wood remains one of the most important plant products to this day.
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