The build plate in 3D printing is preheated to prevent what issue?

In 3D printing, preheating the build plate is primarily done to address warping and adhesion problems. When the build plate is heated, it helps maintain the material at an optimal temperature as it is being printed. This is particularly important for certain types of filaments, such as ABS, which can shrink as they cool. If the build plate is cold, the edges of the print may cool and contract more quickly than the interior, leading to warping or lifting of the print from the build surface.

By ensuring that the build plate is preheated, the adhesion between the first layer of filament and the build plate improves, allowing for better initial layer performance and reducing the chance of the print detaching during the printing process. This leads to greater accuracy and quality of the final printed object. Thus, preheating the build plate is a critical step in preventing problems related to warping and adherence during the 3D printing process.