What design feature can help FDM parts support themselves during printing?

Fillets on edges and corners are an important design feature in Fused Deposition Modelling (FDM) that can enhance the structural integrity of printed parts. By incorporating fillets, the transition between surfaces becomes smoother and more gradual, which helps distribute stress more evenly throughout the part. This is particularly beneficial during the printing process, as it minimizes the risk of delamination or failure at sharp edges and corners, thereby allowing the part to better support itself as it is built layer by layer.

Moreover, the use of fillets can aid in reducing the need for additional support structures. Sharp edges can create stress concentrations that may lead to warping or weaknesses in the printed object, especially as layers are added. The rounded design of fillets mitigates this issue, leading to stronger and more stable prints. In situations where overhangs may occur, filleted edges can also help in easing the transition of extruded material, enhancing the quality of the final part. This is particularly advantageous in complex designs where geometric constraints might complicate the printing process.