What is a critical defect to avoid when achieving successful FDM prints?

Warping is a critical defect to avoid in Fused Deposition Modeling (FDM) prints because it can significantly affect the accuracy and quality of a 3D print. Warping occurs when the material shrinks or cools unevenly during the printing process, causing the corners or edges of the print to lift away from the build plate. This results in distortion, misalignment, and ultimately a failed print. Ensuring that the print adheres properly to the build surface, maintaining consistent temperatures, and using appropriate materials can help mitigate warping.

In contrast, layer adhesion is crucial for the structural integrity of the print, but it is not considered a defect; rather, it is an essential characteristic for a successful outcome. Correct dimensions are necessary for the part to fit properly within the intended assembly, and a smooth surface finish enhances aesthetic quality and functionality. While each of these aspects is important, avoiding warping directly influences the overall success and usability of the printed object.