In three years of 3D printing, the author has shifted from using PLA to PETG for functional parts due to its superior strength, flexibility, and heat resistance. PLA remains a good choice for beginners and decorative prints, but it fails under stress and heat, leading to warping or cracking. PETG, on the other hand, withstands the everyday demands of functional parts like brackets and cable clips, which require durability and some flexibility. Although PETG can be more challenging to print due to issues like stringing and bed adhesion, once a reliable profile is established, it becomes a dependable choice. The author notes that while PETG may not produce the most visually appealing prints, its practicality and resilience make it the preferred filament for parts that need to perform reliably over time. This balance of qualities positions PETG as the go-to filament for various applications, especially in environments where heat and stress are factors.