How to Avoid the “Elephant Foot” Effect in FDM 3D Printing

Additive manufacturing offers a significant advantage in design freedom. However, this advantage can be jeopardized when the 3D printer lacks proper configuration or the design and modeling phase is not optimized. Consequently, a range of 3D printing issues may arise, such as stringing, warping, and ghosting. One prevalent problem is known as the “elephant’s foot,” commonly seen in FDM 3D printing when the first layer extends wider than intended, resembling the shape of an elephant’s foot.

This issue arises due to the close proximity of the printing nozzle to the base plate during the printing process, resulting in a “z-stepping” effect. Consequently, the nozzle exerts pressure on the first layer while extruding, causing it to stretch and adversely affecting its adhesion to the plate. The presence of the elephant’s foot substantially diminishes the overall dimensional accuracy and manufacturing tolerances of the final part. Because of this, part assembly becomes challenging, if not impossible, due to an inaccurate fit. Additionally, the visual appearance of the part is also compromised by this error, despite some improvement being attainable through post-treatment. Nonetheless, the elephant’s foot remains noticeable in many instances, impacting the overall aesthetics of the part. In this guide, we will delve into the causes of this common 3D printing error and provide valuable insights on how to prevent it.

Photo credits: Prusa

Tips to Avoid Elephant Foot In 3D Printing

To begin with, ensuring proper alignment of the printing plate and maintaining an appropriate distance between the nozzle and the plate is crucial. Manual calibration can help achieve this. To calibrate, you’ll need a thin layer of paper or a slim metal piece. The chosen holder is then moved between the nozzle and the printing tray until encountering slight resistance, indicating the correct distance. Conducting a test print of the first layer will verify the calibration’s accuracy.