Two walls suit light-duty prints, three are a strong default for functional parts, and four or more belong on parts that need extra rigidity, impact resistance, or leak resistance.
Choose between gyroid and grid infill by matching the pattern to the load, material, slicer behavior, and print reliability—not by chasing a universal winner.
A practical explanation of the hotend’s cold side, melt zone, nozzle, cooling system, flow capacity, and most common failure modes.
Understand how FDM line width differs from nozzle diameter and layer height, then choose sensible widths for walls, first layers, bridges, and functional prints.
