Common mistakes when setting support wall thickness for 3D models include inconsistent thickness (causing layer adhesion issues), walls too thin (leading to print failures or fragility), walls too thick (wasting material/time), and not adjusting for print orientation.
Inconsistent thickness disrupts even layer deposition, while too thin walls may break during printing or use. Excess thickness adds unnecessary weight and cost. Ignoring orientation—like vertical prints needing thicker walls for strength—can weaken parts.
For beginners, start with your printer’s recommended thickness (1–3mm for FDM) and test small samples to refine without waste.