{"id":4212,"date":"2026-04-24T01:02:49","date_gmt":"2026-04-24T01:02:49","guid":{"rendered":"https:\/\/nylonplastic.com\/?p=4212"},"modified":"2026-06-10T06:02:49","modified_gmt":"2026-06-10T06:02:49","slug":"3d-printing-nylon-fdm-vs-sls-technical","status":"publish","type":"post","link":"https:\/\/nylonplastic.com\/vi\/3d-printing-nylon-fdm-vs-sls-technical\/","title":{"rendered":"In 3D b\u1eb1ng s\u1ee3i nylon: So s\u00e1nh c\u00f4ng ngh\u1ec7 FDM v\u00e0 SLS trong s\u1ea3n xu\u1ea5t m\u1eabu th\u1eed nghi\u1ec7m ch\u1ee9c n\u0103ng"},"content":{"rendered":"
\"Nylon
Nylon 3D Printing FDM vs SLS \u2014 Nylon Plastic<\/figcaption><\/figure>\n

Nylon 3D Printing: FDM vs. SLS for Functional Prototypes and Small-Batch Production<\/h2>\n

The choice between FDM (fused deposition modeling) and SLS (selective laser sintering) for nylon parts is one of the most consequential process decisions in additive manufacturing. Both use nylon \u2014 but the mechanical properties, surface quality, design freedom, and cost structures are fundamentally different.<\/p>\n

This guide cuts through the marketing noise to give engineering buyers a clear decision framework. We cover the technical realities of each process, a direct property comparison, and real-world guidance for common applications in automotive, industrial equipment, and consumer products.<\/p>\n

\"SLS
SLS 3D printing process with nylon powder \u2014 Nylon Plastic<\/figcaption><\/figure>\n

Process Fundamentals: How FDM and SLS Actually Work<\/h2>\n

Understanding the mechanical difference between the two processes explains most of the property and quality trade-offs that follow.<\/p>\n

FDM (M\u00f4 h\u00ecnh h\u00f3a b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p \u0111\u1eafp l\u1edbp)<\/strong> extrudes molten nylon filament layer by layer through a heated nozzle (typically 230-280\u00b0C for nylon). Parts are built on a heated bed, and support structures are printed in the same or a breakaway filament. The bond between layers is primarily thermal diffusion \u2014 not molecular fusion \u2014 making layer adhesion the primary weakness.<\/p>\n

SLS (H\u1ee3p kim b\u1eb1ng tia laser ch\u1ecdn l\u1ecdc)<\/strong> fuses nylon powder (typically PA12) using a high-power laser that sinters powder particles together in a heated build chamber (typically 170-190\u00b0C). No support structures are needed because unsintered powder supports overhanging geometry. Parts are fully dense in all directions \u2014 more isotropic than FDM.<\/p>\n

\"FDM
FDM 3D printing extrusion process \u2014 Nylon Plastic<\/figcaption><\/figure>\n

Mechanical Property Comparison<\/h2>\n

The table below presents tensile, impact, and thermal properties for nylon FDM and SLS parts tested per ISO standards. Values represent typical properties of well-optimized parts.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
T\u00e0i s\u1ea3n<\/th>\nPA12 SLS (typical)<\/th>\nPA6 FDM (typical)<\/th>\nPA6 FDM (optimized)<\/th>\nGhi ch\u00fa<\/th>\n<\/tr>\n<\/thead>\n
\u0110\u1ed9 b\u1ec1n k\u00e9o (MPa)<\/td>\n46-50<\/td>\n40-50<\/td>\n50-58<\/td>\nSLS PA12 limited by porosity<\/td>\n<\/tr>\n
Tensile Modulus (GPa)<\/td>\n1.7-1.9<\/td>\n1.5-1.8<\/td>\n1.7-2.0<\/td>\nSimilar range<\/td>\n<\/tr>\n
\u0110\u1ed9 gi\u00e3n d\u00e0i khi \u0111\u1ee9t<\/td>\n10-15%<\/td>\n20-50%<\/td>\n15-30%<\/td>\nFDM more ductile<\/td>\n<\/tr>\n
Notched Izod Impact (kJ\/m\u00b2)<\/td>\n4.5-6.0<\/td>\n3-5<\/td>\n5-8<\/td>\nSLS better for PA12<\/td>\n<\/tr>\n
HDT at 1.82 MPa (\u00b0C)<\/td>\n175-182<\/td>\n65-75<\/td>\n65-75<\/td>\nSLS PA12 much higher<\/td>\n<\/tr>\n
Moisture Absorption (24h)<\/td>\n0.5-1.0%<\/td>\n5-8%<\/td>\n5-8%<\/td>\nPA12 far superior<\/td>\n<\/tr>\n
Isotropy<\/td>\nHigh (90%+)<\/td>\nLow (60-70%)<\/td>\nTh\u1ea5p<\/td>\nFDM highly anisotropic<\/td>\n<\/tr>\n
Surface Roughness (Ra, \u00b5m)<\/td>\n6-12<\/td>\n8-15<\/td>\n5-10<\/td>\nSLS smoother after bead blast<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Design Envelope: What Each Process Can and Cannot Do<\/h2>\n

Beyond mechanical properties, the geometric capabilities of each process determine which applications each can serve.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
Design Factor<\/th>\nFDM Nylon<\/th>\nSLS Nylon (PA12)<\/th>\nWinner<\/th>\n<\/tr>\n<\/thead>\n
Minimum wall thickness<\/td>\n0.8 mm<\/td>\n0.5 mm<\/td>\nSLS<\/td>\n<\/tr>\n
Minimum feature size<\/td>\n0.5 mm<\/td>\n0.3 mm<\/td>\nSLS<\/td>\n<\/tr>\n
Overhang requirements<\/td>\nRequires supports<\/td>\nSelf-supporting<\/td>\nSLS<\/td>\n<\/tr>\n
Internal channels<\/td>\nRequires supports<\/td>\nNatural hollow printing<\/td>\nSLS<\/td>\n<\/tr>\n
Large parts (>300mm)<\/td>\nT\u1ed1t<\/td>\nLimited by build volume<\/td>\nFDM<\/td>\n<\/tr>\n
Dimensional tolerance<\/td>\n\u00b10.3 mm<\/td>\n\u00b10.2 mm<\/td>\nSLS<\/td>\n<\/tr>\n
Smooth surface finish<\/td>\nPoor (layer lines)<\/td>\nModerate (rough powder)<\/td>\nSLS<\/td>\n<\/tr>\n
Post-processing ease<\/td>\nEasy (sand, paint)<\/td>\nModerate (vapor smooth)<\/td>\nFDM<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Material Cost and Production Economics<\/h2>\n

For engineering buyers evaluating 3D printing against CNC or injection molding, understanding total part cost \u2014 not just material price \u2014 is essential.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
Cost Factor<\/th>\nFDM (Nylon)<\/th>\nSLS (PA12)<\/th>\nGhi ch\u00fa<\/th>\n<\/tr>\n<\/thead>\n
Material cost ($\/kg)<\/td>\n$45-80<\/td>\n$60-110<\/td>\nSLS powder more expensive<\/td>\n<\/tr>\n
Machine cost (depreciation)<\/td>\nLow-Medium<\/td>\nCao<\/td>\nSLS machines 3-5x more expensive<\/td>\n<\/tr>\n
Support material waste<\/td>\n10-30%<\/td>\n0% (unused powder reusable)<\/td>\nSLS wins for complex parts<\/td>\n<\/tr>\n
Post-processing labor<\/td>\nTrung b\u00ecnh<\/td>\nLow-Medium<\/td>\nDepends on surface requirement<\/td>\n<\/tr>\n
Batch efficiency<\/td>\nLow (serial printing)<\/td>\nHigh (stackable parts)<\/td>\nSLS wins for batches<\/td>\n<\/tr>\n
Best economics<\/td>\nPrototypes, large parts<\/td>\nSmall complex parts, batches<\/td>\nProcess selection by geometry<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Application-Specific Recommendations<\/h2>\n

The right process depends on your application’s requirements \u2014 there is no universally superior technology.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
Application<\/th>\nRecommended Process<\/th>\nCh\u1ea5t li\u1ec7u<\/th>\nWhy<\/th>\n<\/tr>\n<\/thead>\n
Functional gears (dry environment)<\/td>\nSLS or FDM PA6-CF<\/td>\nSLS PA12 or PA6-GF FDM<\/td>\nStrength and wear resistance<\/td>\n<\/tr>\n
Functional gears (wet\/oily)<\/td>\nSLS PA12<\/td>\nPA12 SLS<\/td>\nChemical resistance, low moisture<\/td>\n<\/tr>\n
Snap-fits and living hinges<\/td>\nFDM PA6<\/td>\nPA6 FDM filament<\/td>\nDuctility, flexibility<\/td>\n<\/tr>\n
Chemical-resistant enclosures<\/td>\nSLS PA12<\/td>\nPA12 SLS<\/td>\nBroad chemical resistance<\/td>\n<\/tr>\n
Large housings and covers<\/td>\nFDM PA6-GF30<\/td>\nPA6-GF30 FDM<\/td>\nLarge format, structural<\/td>\n<\/tr>\n
High-heat components (>150\u00b0C)<\/td>\nSLS PA12<\/td>\nPA12 SLS<\/td>\nHDT 175\u00b0C vs 70\u00b0C for FDM<\/td>\n<\/tr>\n
Low-volume bridge production<\/td>\nSLS PA12<\/td>\nPA12 SLS<\/td>\nNo tooling, batch economics<\/td>\n<\/tr>\n
Early-stage prototypes<\/td>\nFDM PA6<\/td>\nPA6 or PA66 FDM<\/td>\nLowest cost, fastest turnaround<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\n

C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n
\nWhen is Nylon 3D Printing: FDM vs. SLS for Functional Prototypes a good option?<\/summary>\n
\n

Nylon 3D Printing: FDM vs. SLS for Functional Prototypes is a good option when fast iteration, complex geometry, low tooling cost, or low-volume production is more important than molded-part unit cost.<\/p>\n<\/div>\n<\/details>\n

\nWhat should be checked before choosing Nylon 3D Printing: FDM vs. SLS for Functional Prototypes?<\/summary>\n
\n

Ki\u1ec3m tra k\u00edch th\u01b0\u1edbc chi ti\u1ebft, t\u00ednh ch\u1ea5t v\u1eadt li\u1ec7u, \u0111\u1ed9 nh\u00e1m b\u1ec1 m\u1eb7t, dung sai k\u00edch th\u01b0\u1edbc, m\u1ee9c \u0111\u1ed9 ti\u1ebfp x\u00fac v\u1edbi nhi\u1ec7t, h\u01b0\u1edbng t\u1ea3i tr\u1ecdng v\u00e0 xem c\u00f3 c\u1ea7n x\u1eed l\u00fd sau gia c\u00f4ng hay kh\u00f4ng.<\/p>\n<\/div>\n<\/details>\n

\nHow does Nylon 3D Printing: FDM vs. SLS for Functional Prototypes compare with CNC machining?<\/summary>\n
\n

In 3D c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c h\u00ecnh d\u1ea1ng ph\u1ee9c t\u1ea1p m\u1ed9t c\u00e1ch nhanh ch\u00f3ng, trong khi gia c\u00f4ng CNC th\u01b0\u1eddng mang l\u1ea1i \u0111\u1ed9 b\u1ec1n cao h\u01a1n cho c\u00e1c b\u1ec1 m\u1eb7t ch\u00ednh x\u00e1c, dung sai ch\u1eb7t ch\u1ebd h\u01a1n v\u00e0 s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u \u0111\u1ea1t ti\u00eau chu\u1ea9n s\u1ea3n xu\u1ea5t.<\/p>\n<\/div>\n<\/details>\n

\nWhat affects the cost of Nylon 3D Printing: FDM vs. SLS for Functional Prototypes?<\/summary>\n
\n

Chi ph\u00ed ph\u1ee5 thu\u1ed9c v\u00e0o v\u1eadt li\u1ec7u, th\u1ec3 t\u00edch in, th\u1eddi gian in, \u0111\u1ed9 d\u00e0y l\u1edbp, vi\u1ec7c th\u00e1o khung \u0111\u1ee1, ho\u00e0n thi\u1ec7n, ki\u1ec3m tra v\u00e0 s\u1ed1 l\u01b0\u1ee3ng chi ti\u1ebft trong m\u00f4 h\u00ecnh.<\/p>\n<\/div>\n<\/details>\n<\/div>\n\t\t\t

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