Fused Deposition Modeling (FDM): Do FDM systems extrude molten thermoplastic through a nozzle to deposit layers that match the part’s sliced cross-sections?

Introduction / Context:
Fused Deposition Modeling (FDM), also called Material Extrusion, builds parts by heating and extruding thermoplastic filament (e.g., ABS, PLA, PC, nylon) through a nozzle and placing material along toolpaths derived from sliced cross-sections. The statement correctly describes FDM's core mechanism.

Given Data / Assumptions:

• Thermoplastic filament is available in a controlled diameter.
• Nozzle temperature exceeds polymer softening point; cooling solidifies layers.
• Slicing software generates per-layer toolpaths and support structures if needed.

Concept / Approach:
Each layer adheres to the previous via thermal bonding. Parameters like extrusion temperature, flow rate, layer height, and raster orientation affect strength, porosity, and surface finish. Supports or breakaway/soluble structures may be required for overhangs.

Step-by-Step Solution:

Verification / Alternative check:
Cross-sections reveal characteristic bead tracks and anisotropic properties (stronger in-plane than across layers), consistent with deposition mechanics.

Why Other Options Are Wrong:
Photopolymer resins and metal powder processes correspond to SLA/DLP or PBF/DED, not FDM. Supports are often needed; FDM is not limited to support-free geometries.

Common Pitfalls:
Incorrect temperatures causing poor adhesion; insufficient cooling on bridges; ignoring moisture in hygroscopic filaments leading to bubbles/stringing.

Final Answer:
Correct