How does extrusion rate affect the final quality of an FDM print?

Extrusion rate plays a crucial role in determining the final quality of an FDM (Fused Deposition Modelling) print. When the extrusion rate is not calibrated correctly, it can lead to two main issues: under-extrusion and over-extrusion.

Under-extrusion occurs when the extrusion rate is too low, resulting in insufficient material being deposited. This can lead to weak layers and gaps in the print, ultimately compromising the structural integrity and surface finish of the printed object. Features might not be defined well, leading to a rough appearance and possibly structural failure.

On the other hand, over-extrusion happens when the extrusion rate is higher than necessary. This causes excess material to be laid down, leading to features merging together, blobs, and a generally messy appearance. The print may also have increased weight and may be less precise, making dimensions harder to control.

Recognizing the importance of extrusion rate informs users about the delicate balance needed to achieve optimal results in FDM printing. Proper calibration and adjustment based on the specific materials and designs used in printing can greatly enhance the overall outcome, ensuring reliability and aesthetics in the final product.