Quick answer: FDM 3D printing extrudes molten plastic in 100–300 micron layers with a tolerance of ±0.1–0.3 mm; it is cheap and durable, and suits engineering parts and large models. Resin 3D printing (SLA/DLP/LCD) cures liquid resin with UV light in 25–100 micron layers with a tolerance of ±0.05–0.1 mm, giving a smooth surface and details down to 0.05 mm; it suits display models, figures and jewelry. At 2026 market rates in Ho Chi Minh City, resin printing costs about 1.5–2.5 times more than FDM. Choose by purpose: resin for looks and fine detail; FDM for strength, low cost and size.
“Should this part be printed in regular plastic or resin?” is a question CT3D hears almost every day. The right answer isn’t “which is better” but “which fits your purpose.” This article compares FDM vs. resin 3D printing across 9 technical criteria, with a quick-selection table by scenario. For a broader comparison including MJF and metal, see our pillar article on 3D printing technologies.
FDM vs. Resin 3D Printing: How Do the Principles Differ?
FDM works like a computer-controlled hot glue gun: thermoplastic filament is melted, extruded through a nozzle (usually 0.4 mm) and laid down line by line, layer by layer. The part is made of plastic “strands” placed side by side and stacked. See what is FDM 3D printing for details.
Resin printing uses a liquid photopolymer. A UV light source – a laser (SLA), a projector (DLP) or an LCD screen – exposes the exact cross-section shape, curing the resin layer by layer. There is no nozzle, so resolution isn’t limited by a filament diameter. The laser mechanism is explained in what is SLA 3D printing; the differences between the three light sources are covered in SLA vs. DLP vs. LCD.
This difference in mechanism drives almost every difference in quality, strength and cost below.
FDM vs. Resin Compared Across 9 Criteria
| Criterion | FDM | Resin (SLA/DLP/LCD) |
|---|---|---|
| 1. Layer height | 100–300 microns | 25–100 microns |
| 2. Dimensional tolerance | ±0.1–0.3 mm | SLA ±0.05–0.1 mm; DLP ±0.03–0.08 mm |
| 3. Smallest feature | Close to the nozzle diameter | Down to 0.05 mm (SLA) |
| 4. Surface | Visible layer lines; sanding needed for a smooth finish | Smooth, layer lines barely visible |
| 5. Strength and toughness | Tough thermoplastics; weaker across layers | Standard resin is stiff but brittle; Tough/ABS-like resins available |
| 6. Heat and outdoor resistance | ABS and ASA handle heat and UV well | Requires heat-resistant resin; many resins yellow in sunlight |
| 7. Build size | Large, easy to split and assemble | CT3D prints resin up to 800×800×500 mm |
| 8. Post-processing | Remove supports, sand (optional) | Mandatory solvent wash, UV curing, support removal |
| 9. Cost | Low; CT3D from 650 VND/g (≈ US$0.025/g) for PLA, PETG | About 1.5–2.5 times more than FDM (market rates) |
Source: CT3D technical documentation; CT3D FDM price list 2026; 2026 market rates in Ho Chi Minh City (not CT3D’s prices).
A Closer Look at the Key Criteria
Accuracy: why does resin win on small details?
In FDM, each printed line is roughly as wide as the nozzle. A 0.3 mm feature is almost impossible to print with a 0.4 mm nozzle. Plastic also shrinks as it cools and pulls at corners, so errors grow on larger parts. In resin printing, resolution depends on the light spot size – far smaller than a nozzle. That’s why raised lettering, ornamentation, figure eyes and fingers, and small gear teeth all look noticeably better in resin.
Even so, for large parts and simple box shapes, a well-calibrated FDM printer is good enough for ordinary assemblies. Critical mating surfaces can be compensated or post-machined. How to design clearances for each technology is covered in accuracy and tolerances in 3D printing.
Strength: resin isn’t automatically weaker
FDM thermoplastics such as PETG and ABS are tough: under overload, parts usually bend before they break. Standard resin is stiff and looks great but is brittle, snapping suddenly on impact. However, FDM has its own weakness: bonds between layers are weaker than within a layer, so parts can delaminate if the load comes from the wrong direction. Resin cures into a continuous solid and is less anisotropic.
If you need both fine detail and toughness, Tough/ABS-like resin is the middle ground; see Tough/ABS-like resin.
Heat resistance and outdoor use
For parts in hot machine compartments, inside cars parked in the sun, or outdoors long-term, FDM in ABS or ASA is usually the safer choice. ASA is widely used for outdoor parts thanks to its UV resistance. With resin, you need a heat-resistant resin (market surcharge +60–100%) and a UV-protective coating.
Surface finish and finishing costs
This is a criterion many people overlook when comparing prices. An FDM model that needs a high-quality paint job requires several rounds of sanding, filling and priming to hide the layer lines – a time-consuming and costly process. A resin model already has a smooth surface and usually only needs light sanding of support marks before painting. So for display models that need paint finishing, the total cost of resin may not differ as much as the initial print price suggests.
FDM vs. Resin Cost Comparison by Size
The table below puts all-in market prices by size in Ho Chi Minh City (2026) side by side so you can see the gap. Prices are indicative.
| Model size | FDM (market) | Standard resin (market) |
|---|---|---|
| Under 5 cm | from ~80,000 VND (≈ US$3) | 150,000–400,000 VND (≈ US$6–15) |
| About 10 cm | 300,000–700,000 VND (≈ US$12–27) | 300,000 – 1.2 million VND (≈ US$12–46) (5–10 cm); 800,000 – 2.5 million VND (≈ US$31–96) (10–15 cm) |
| About 20 cm | 800,000 – 2 million VND (≈ US$31–77) | 1.5–3.5 million VND (≈ US$58–135) (15–20 cm) |
| 20–30 cm | — | 3–7 million VND (≈ US$115–270) |
| 25–50 cm | 3–15 million VND (≈ US$115–580) | Over 30 cm: quoted per file |
Source: 2026 market price levels in Ho Chi Minh City, not CT3D’s prices. CT3D pricing: FDM charged by the gram (PLA, PETG from 650 VND/g); resin quoted per file.
For FDM at CT3D, you can estimate the cost yourself with the formula: weight (grams) × material unit price. For example, a 200 g PLA part → 200 × 650 VND = 130,000 VND (≈ US$5) for printing, excluding post-processing. Resin pricing depends on volume, height, orientation and supports, so CT3D quotes it per file. The detailed calculation is in our pillar article on 3D printing prices.
Quick Selection: FDM or Resin in 8 Scenarios
| Scenario | Recommended | Why |
|---|---|---|
| Figures, small statues, character models | Resin | Sharp facial features, hair and fingers |
| Jewelry, casting patterns | Castable resin / wax | Details down to 0.05 mm, burns out cleanly during casting |
| Device enclosures, test-fit prototypes | FDM (PETG, ABS) | Durable, cheap, fast design iterations |
| Factory jigs and fixtures | FDM (ABS, carbon fiber) | Tough, load-bearing, low cost |
| Product display models, photography | Resin | Smooth surface, paints well, little sanding |
| Outdoor parts | FDM (ASA) | UV-resistant, heat-resistant |
| Large architectural models | FDM, with small details in resin | Cheap large masses, fine details look great |
| Transparent parts | Clear resin | Polishing and gloss coating achieve clarity |
Source: CT3D consulting experience.
Hybrid approach: you don’t have to choose just one
For large models, CT3D often prints the frame, body and base in FDM to save money, while faces, logos and small details are printed in resin, then everything is assembled and painted uniformly. This balances cost and appearance. See 3D printed architectural models and custom 3D printed figures.
Common Mistakes When Choosing Between FDM and Resin
- Choosing resin for impact-loaded parts: standard resin is brittle and breaks easily at clip roots and snap-fits. Fix: use FDM PETG/ABS or Tough resin.
- Choosing FDM for close-up photography models: layer lines show clearly under lights. Fix: print in resin, or budget for sanding and painting.
- Leaving resin models in the sun: they yellow and gradually become brittle. Fix: UV-protective coating, or use ASA.
- Walls too thin for FDM: walls thinner than twice the nozzle diameter often under-print. Fix: increase wall thickness.
- Hollowing resin models without drain holes: resin trapped inside causes cracks after a few days. See common resin 3D printing problems.
- Comparing print prices only and forgetting finishing costs: an FDM model that needs a good paint job may take more sanding labor than a resin model.
Checklist: What to Send So CT3D Can Recommend the Right Technology
CT3D follows a 6-step process: send your file (STL/STEP/OBJ/3MF via our website, Zalo or email) → technical requirements → engineers review the file and calculate weight → quote with lead time → confirmation and production → delivery to your door or pickup at the workshop. Nationwide delivery within 1–3 days after completion. To help our engineers choose correctly between FDM and resin, tell us:
- Purpose: display, test fit, end use, casting pattern or silicone mold master.
- Overall size and the smallest feature on the model.
- Whether it will face loads, impact, heat or sunlight.
- Whether it needs paint, a gloss coat or transparency.
- Quantity and delivery deadline. Typical market lead times: 1–3 days for a ready file; 3–7 days if modeling is needed; 7–14 days with painting.
- Your expected budget – so our engineers can propose a hybrid option if needed.
Conclusion: Choose by Purpose, Not by “Which Technology Is Better”
FDM and resin don’t replace each other; they complement each other. FDM is the economical choice for engineering parts, large models, jigs and outdoor parts. Resin is the choice for fine detail, surface quality and small features. If you’re unsure, just send your file – CT3D engineers will propose an approach and quote both options for comparison. You can also learn more about CT3D’s high-resolution SLA resin printing (in Vietnamese), our resin 3D printing page, or return to our pillar article on 3D printing technologies to compare MJF and SLM as well.
Frequently Asked Questions
Are resin prints as strong as FDM prints?
Standard resin is stiff but more brittle than FDM plastics such as PETG and ABS. If you need durability, use FDM or Tough/ABS-like resin.
Why is resin printing more expensive than FDM?
Resin costs more as a material (market rates of 0.8–3 million VND/kg (≈ US$31–115/kg) versus about 250,000 VND/kg (≈ US$10/kg) for PLA) and requires washing and UV curing. At market rates, resin printing costs about 1.5–2.5 times more than FDM.
Should figures be printed in FDM or resin?
Resin, because faces, hair and fingers need sharp detail. FDM suits large figures or when cost is the priority.
Which technology is best for outdoor parts?
FDM with UV-resistant ASA is the common choice. Resin models used outdoors need a UV-protective coating.
How much do FDM and resin tolerances differ?
According to CT3D’s documentation, FDM is about ±0.1–0.3 mm; SLA ±0.05–0.1 mm; DLP ±0.03–0.08 mm.
Real Footage from the CT3D Workshop
Watch Smooth-surface, large-format SLA 3D printing, filmed by CT3D, to get a clearer picture of the process and the finished quality. More videos are on our YouTube channel Chế Tạo Vlog – CT3D.
Contact CT3D – Send Your File, Get a Fast Quote
Whether you have a 3D file, a 2D drawing, photos or just an idea, you can send it to CT3D. Our engineers will check the file, recommend the right technology and material, and send you a quote with a lead time.
- Email: [email protected] – [email protected]
- Hotline / Zalo: +84 975 008 728 (Mr. Thai) – +84 985 936 728 (Mr. Dang), or use our contact form
- Head office: Binh Duong.
- Workshops in Ho Chi Minh City: Linh Trung (Thu Duc), Tam Binh (Thu Duc), District 6 (former).
- Other workshops and drop-off points: Can Tho, Da Nang, Bien Hoa, Ba Ria – Vung Tau, Hanoi, Hai Duong, Hai Phong. Nationwide delivery across Vietnam.
- Website: ct3dgroup.com – in3d.edu.vn
CT3D – 3D design & prototyping: 3D printing, 3D scanning, reverse engineering, silicone mold making, painting and finishing, CNC machining, composite fabrication, plus 3D printers and 3D printing materials.
Danh sách cửa hàng:
CT3D là đơn vị cung cấp trọn gói các dịch vụ thiết kế và sản xuất theo yêu cầu tại TP.HCM và khu vực lân cận (Bình Dương, Đồng Nai, Long An…). Với năng lực khép kín từ thiết kế 3D, in 3D (FDM, resin/SLA, SLS, in 3D kim loại), scan 3D – thiết kế ngược, làm khuôn, đúc composite – poly resin – poly stone đến gia công CNC và sơn màu hoàn thiện, CT3D đồng hành cùng khách hàng qua toàn bộ quy trình – từ ý tưởng, bản vẽ hay sản phẩm mẫu đến thành phẩm hoàn chỉnh. Dù bạn cần tạo mẫu nhanh, sản xuất số lượng, chế tác tượng – mô hình – quà tặng hay linh kiện kỹ thuật, đội ngũ CT3D sẽ tư vấn công nghệ và vật liệu phù hợp, đảm bảo sản phẩm sắc nét, đúng yêu cầu và tối ưu chi phí. Khách hàng tại TP.HCM và vùng lân cận có thể trao đổi trực tiếp, gửi file online và nhận sản phẩm thuận tiện, hỗ trợ cả đơn gấp lẫn dự án số lượng.
CT3D cung cấp trọn gói các dịch vụ thiết kế và sản xuất theo yêu cầu, phục vụ khách hàng tại Hà Nội và các tỉnh lân cận (Bắc Ninh, Hưng Yên, Hải Phòng, Vĩnh Phúc…). Với năng lực khép kín từ thiết kế 3D, in 3D (FDM, resin/SLA, SLS, in 3D kim loại), scan 3D – thiết kế ngược, làm khuôn, đúc composite – poly resin – poly stone đến gia công CNC và sơn màu hoàn thiện, CT3D đồng hành cùng khách hàng qua toàn bộ quy trình – từ ý tưởng, bản vẽ hay sản phẩm mẫu đến thành phẩm hoàn chỉnh. Quy trình làm việc thuận tiện: bạn gửi file 3D hoặc mô tả ý tưởng qua online, đội ngũ CT3D tư vấn công nghệ – vật liệu, báo giá nhanh và giao hàng tận nơi tại Hà Nội. Dù bạn cần tạo mẫu nhanh, sản xuất số lượng, chế tác tượng – mô hình – quà tặng hay linh kiện kỹ thuật, CT3D đều đáp ứng với sản phẩm sắc nét, đúng yêu cầu và tối ưu chi phí.
