Parts fabricated using Fused Filament Fabrication (FFF), the most widely utilized polymer additive manufacturing process, typically exhibit a rough side surface finish due to the extrusion process’s inherent physics. While carbon fiber-reinforced materials enhance mechanical strength and expand the applications of FFF, they tend to worsen the surface finish due to reduced filament viscosity. This work presents a laser-assisted, in-process surface smoothing technology that reduces surface roughness from 28 microns to 11 microns. This technology is compatible with both flat and curved surfaces. The comparison between carbon fiber-reinforced nylon and homogeneous materials, as well as the process’s effect on mechanical behavior, are also explored. The proposed technology improves dimensional accuracy and ensures uniform stress distribution in materials, making it suitable for batch production applications requiring high tolerance and strength, such as high-end furniture, vehicles, medical devices, and aerospace components.
DaminaboSCGoelSGrammatikosSA, et al.Fused deposition modeling-based additive manufacturing (3D printing): techniques for polymer material systems. Mater Today Chem2020; 16: 100248.
2.
WuHFahyWPKimS, et al.Recent developments in polymers/polymer nanocomposites for additive manufacturing. Prog Mater Sci2020; 111: 100638.
3.
González-HenríquezCMSarabia-VallejosMARodriguez-HernandezJ. Polymers for additive manufacturing and 4D-printing: materials, methodologies, and biomedical applications. Prog Polym Sci2019; 94: 57–116.
4.
SpoerkMHolzerCGonzalez‐GutierrezJ. Material extrusion-based additive manufacturing of polypropylene: a review on how to improve dimensional inaccuracy and warpage. J Appl Polym Sci2020; 137: 48545.
5.
BrenkenBBarocioEFavaloroA, et al.Fused filament fabrication of fiber-reinforced polymers: a review. Addit Manuf2018; 21: 1–16.
6.
Turner BNStrongRGold SA. A review of melt extrusion additive manufacturing processes: I. Process design and modeling. Rapid Prototyp J2014; 20: 192–204.
7.
HarrisCGJursikNJSRochefortWE, et al.Additive manufacturing with soft TPU--Adhesion strength in multimaterial flexible joints. Front Mech Eng2019; 5: 37.
8.
HillNHaghiM. Deposition direction-dependent failure criteria for fused deposition modeling polycarbonate. Rapid Prototyp J2014; 20: 221–227.
9.
HanPTofangchiACarrD, et al.Enhancing the piezoelectric properties of 3D printed PVDF using concurrent Torsional Shear strain. Polymers (Basel)2023; 15: 4204.
10.
WangYShiJLiuZ. Bending performance enhancement by nanoparticles for FFF 3D printed nylon and nylon/Kevlar composites. J Compos Mater2020: 0021998320963524.
11.
HanPTofangchiAZhangS, et al.Effect of in-process laser interface heating on strength isotropy of extrusion-based additively manufactured PEEK. Procedia Manuf2020; 48: 737–742.
12.
HanPZhangSTofangchiA, et al.Development and implementation of in-process, orbiting laser-assisted healing technique on fused filament fabrication. Int J Adv Des Manuf Technol2023; 127: 1517–1524.
13.
HanPTofangchiAZhangS, et al.Interface healing between Adjacent tracks in fused filament fabrication using in-process laser heating. 3D Print Addit Manuf2023; 10: 808–815.
14.
AlmeidaJJHSMiettinenALéonardF, et al.Microstructure and damage evolution in short carbon fibre 3D-printed composites during tensile straining. Compos B Eng2025; 292: 112073.
15.
AlmeidaJJHSChristoffBGTitaV, et al.A concurrent fibre orientation and topology optimisation framework for 3D-printed fibre-reinforced composites. Compos Sci Technol2023; 232: 109872.
16.
RafieeMFarahaniRDTherriaultD. Multi-material 3D and 4D printing: a survey. Adv Sci2020; 7: 1902307.
17.
MasoodSHSongWQ. Development of new metal/polymer materials for rapid tooling using fused deposition modelling. Mater Des2004; 25: 587–594.
18.
VerstraeteGSamaroAGrymonpréW, et al.3D printing of high drug loaded dosage forms using thermoplastic polyurethanes. Int J Pharm2018; 536: 318–325.
19.
ChenXGaoCJiangJ, et al.3D printed porous PLA/nHA composite scaffolds with enhanced osteogenesis and osteoconductivity in vivo for bone regeneration. Biomedical Materials2019; 14: 65003.
20.
KechagiasJDZaoutsosSP. Optimising fused filament fabrication surface roughness for a dental implant. Mater Manuf Process2023; 38: 954–959.
21.
ChristJFAliheidariNAmeliA, et al.3D printed highly elastic strain sensors of multiwalled carbon nanotube/thermoplastic polyurethane nanocomposites. Mater Des2017; 131: 394–401.
22.
RigottiDDorigatoAPegorettiA. 3D printable thermoplastic polyurethane blends with thermal energy storage/release capabilities. Mater Today Commun2018; 15: 228–235.
KarkunMSDharmalingamS. 3D printing technology in aerospace industry–a review. International Journal of Aviation, Aeronautics, and Aerospace2022; 9: 4.
25.
GolhinAPTonelloRFrisvadJR, et al.Surface roughness of as-printed polymers: a comprehensive review. Int J Adv Des Manuf Technol2023; 127: 987–1043.
26.
PulipakaAGideKMBeheshtiA, et al.Effect of 3D printing process parameters on surface and mechanical properties of FFF-printed PEEK. J Manuf Process2023; 85: 368–386.
27.
HanPZhangSTofangchiA, et al.Relaxation of residual stress in fused filament fabrication part with in-process laser heating. Procedia Manuf2021; 53: 466–471.
28.
HanPTorabniaSRiyadMF, et al.Effect of laser heating on mechanical strength of carbon fiber–reinforced nylon in fused filament fabrication. Int J Adv Des Manuf Technol2024; 133: 6139–6146.
29.
HanPZhangSYangZ, et al.In-process orbiting laser-assisted technique for the surface finish in material extrusion-based 3D printing. Polymers (Basel)2023; 15: 2221.
30.
SongSWangAHuangQ, et al.Shape deviation modeling for fused deposition modeling processes. In: 2014 IEEE International Conference on Automation Science and Engineering (CASE). IEEE, 2014, pp. 758–763.
31.
JinYHeYXueG, et al.A parallel-based path generation method for fused deposition modeling. Int J Adv Des Manuf Technol2015; 77: 927–937.
32.
LeeWWeiCChungS-C. Development of a hybrid rapid prototyping system using low-cost fused deposition modeling and five-axis machining. J Mater Process Technol2014; 214: 2366–2374.
33.
ZhuZDhokiaVNassehiA, et al.Investigation of part distortions as a result of hybrid manufacturing. Robot Comput Integr Manuf2016; 37: 23–32.
34.
VijayaraghavanVGargALamJSL, et al.Process characterisation of 3D-printed FDM components using improved evolutionary computational approach. Int J Adv Des Manuf Technol2015; 78: 781–793.
35.
HuangQZhangJSabbaghiA, et al.Optimal offline compensation of shape shrinkage for three-dimensional printing processes. IIE Trans2015; 47: 431–441.
36.
HuangQNouriHXuK, et al.Predictive modeling of geometric deviations of 3d printed products-a unified modeling approach for cylindrical and polygon shapes. In: 2014 IEEE International Conference on Automation Science and Engineering (CASE). IEEE, 2014, pp. 25–30.
37.
AhnDKimHLeeS. Surface roughness prediction using measured data and interpolation in layered manufacturing. J Mater Process Technol2009; 209: 664–671.
38.
DilberogluUMYamanUDolenM. A comprehensive guide to milling techniques for smoothing the surfaces of 3D-printed thermoplastic parts. Rapid Prototyp J2024; 30: 1648–1662.
39.
KhatoonSKhandelwalARajA, et al.Fabrication of FFF 3D-printed surfaces for PMMA-based biomedical device employing the pre-processing optimization to eliminate the post-processing steps. Progress in Additive Manufacturing2024; 9: 1003–1014.
40.
PandeyPMReddyNVDhandeSG. Improvement of surface finish by staircase machining in fused deposition modeling. J Mater Process Technol2003; 132: 323–331.
41.
GalantucciLMLavecchiaFPercocoG. Quantitative analysis of a chemical treatment to reduce roughness of parts fabricated using fused deposition modeling. CIRP annals2010; 59: 247–250.
42.
GalantucciLMLavecchiaFPercocoG. Experimental study aiming to enhance the surface finish of fused deposition modeled parts. CIRP annals2009; 58: 189–192.
43.
LavecchiaFGuerraMGGalantucciLM. Chemical vapor treatment to improve surface finish of 3D printed polylactic acid (PLA) parts realized by fused filament fabrication. Progress in Additive Manufacturing2021: 1–11.
44.
ChangC-SChenT-HLiT-C, et al.Influence of laser beam fluence on surface quality, microstructure, mechanical properties, and tribological results for laser polishing of SKD61 tool steel. J Mater Process Technol2016; 229: 22–35.
45.
CampanelliSLCasalinoGContuzziN, et al.Taguchi optimization of the surface finish obtained by laser ablation on selective laser molten steel parts. Proced CIRP2013; 12: 462–467.
46.
TaufikMJainPK. Laser assisted finishing process for improved surface finish of fused deposition modelled parts. J Manuf Process2017; 30: 161–177.
47.
ChaiYLiRWPerrimanDM, et al.Laser polishing of thermoplastics fabricated using fused deposition modelling. Int J Adv Manuf Technol; 96.
48.
LambiaseFGennaSLeoneC. Laser finishing of 3D printed parts produced by material extrusion. Opt Lasers Eng2020; 124: 105801.
49.
KaramimoghadamMDezakiMLZolfagharianA, et al.Influence of post-processing CO2 laser cutting and FFF 3D printing parameters on the surface morphology of PLAs: statistical modelling and RSM optimisation. Int J Lightweight Mater Manuf2023; 6: 285–295.
50.
HanPTorabniaSRiyadMF, et al.In-process laser heating for mechanical strength improvement of FFF-printed PEEK. Progress in Additive Manufacturing2024: 1–10.
51.
EzekoyeOALowmanCDFaheyMT, et al.Polymer weld strength predictions using a thermal and polymer chain diffusion analysis. Polym Eng Sci1998; 38: 976–991.
