FDM vs SLA vs SLS: Which 3D Printing Process Fits Your Parts?
NEX3DShare
Choose a 3D printing process around the part you need to make. Filament printing (FDM/FFF) is a practical starting point for general prototypes and fixtures. Resin printing (SLA/MSLA) deserves a closer look when small features and surface finish drive the decision. Powder printing (SLS) can suit complex functional parts and batches that benefit from printing without separate support structures. Material requirements, part size and the work after printing can change the answer.
This guide compares the workflows and connects them to machines offered by NEX3D in Canada. It is a specification-based buying guide, not a hands-on performance test. Specifications checked September 6, 2026.
FDM, SLA and SLS at a glance
Scroll horizontally to read the full table. When focused, use the left and right arrow keys.
| Process | Starting material | How the part is built | Work to plan after printing |
|---|---|---|---|
| FDM / FFF | Thermoplastic filament | A heated nozzle deposits material along a sliced toolpath. | Remove the part, remove supports where used, and finish surfaces if required. |
| SLA / MSLA | Liquid photopolymer resin | Light cures resin into solid layers. Form 4 uses masked SLA with a Low Force Display print engine. | Wash, dry, remove supports where used, and post-cure according to the resin instructions. |
| SLS | Polymer powder | A laser fuses powder; the surrounding loose powder supports the parts. | Cool the build, extract parts, recover powder, and clean the surfaces. |
Process references: Prusa printing glossary, Formlabs Form 4 technology and Formlabs printing-process guide.
Start with FDM when filament and a nozzle suit the job
For brackets, enclosures, fit checks and larger visual models, an FDM printer is worth comparing first. Choose the filament for the part's actual conditions: a display model, a part beside a warm motor and an outdoor fixture have different requirements. PLA, PETG, ASA and fibre-filled materials are not interchangeable.
The printer must also suit that filament. Check nozzle and bed limits, enclosure requirements, nozzle wear resistance, drying and the supported feeding path. An enclosure alone does not establish compatibility. The Prusa material table is a useful starting point for comparing material requirements; the exact filament's technical data sheet remains the deciding reference.
At NEX3D, the Bambu Lab P2S and Prusa CORE One+ (Gen 2) provide two enclosed FDM options to investigate. Compare their dimensions below, then use the printer finder to narrow the wider range. Our filament guide explains the common material choices.
Consider SLA when small features and surface quality matter
A small housing with fine details, a presentation model or a pattern for a downstream process may justify evaluating resin printing. Compare the exact resin's mechanical and thermal properties as carefully as the printer. A resin selected for appearance is not automatically suitable for a stressed clip or a hot fixture.
The Formlabs Form 4 Premium Package is one NEX3D route into this workflow. Formlabs lists Form 4 as masked SLA, with a 200 × 125 × 210 mm build volume. Package contents and service plans matter because the printer is only one part of the setup. Formlabs' Form 4 product specifications explain the platform and package options.
Allow room and time for washing, drying and any prescribed post-curing. The correct process depends on the resin, and support marks may still need finishing. Budget for that work before comparing the cost of a resin part with a filament part. Formlabs' post-processing guidance describes these steps.
Consider SLS when geometry and batch production justify powder handling
SLS can be useful when a part's shape would make separate supports difficult to remove. Loose powder surrounds and supports the parts during printing, allowing multiple components to be arranged within a build. A hollow part still needs a way to remove trapped powder: “no supports” does not mean every enclosed cavity is printable as designed.
The Formlabs Fuse 1+ 30W Starter Package has a 165 × 165 × 300 mm build volume. Compare that usable envelope with your part dimensions, as well as the manufacturer's operating-space requirements. See the Fuse Series technical specifications.
Include cooldown, extraction, cleaning and powder recovery in the production schedule. Recovered powder is blended with fresh powder at the rate specified for the material and process; it is not an unlimited supply of free material. Formlabs explains those steps in its SLS post-processing guide. These handling requirements are part of the equipment decision.
Plan the workspace before purchasing: follow the exact material's safety data sheet and the manufacturer's instructions for ventilation, personal protective equipment, handling and disposal. Formlabs provides guidance for SLA equipment, resins and solvents and SLS powder handling.
Compare actual machines, not just technology names
Scroll horizontally to read the full table. When focused, use the left and right arrow keys.
| Machine | Process | Build volume, mm | Next step |
|---|---|---|---|
| Bambu Lab P2S | FDM | 256 × 256 × 256 | Compare P2S configurations |
| Prusa CORE One+ (Gen 2) | FFF | 250 × 220 × 270 | View the assembled CORE One+ |
| Formlabs Form 4 | Masked SLA | 200 × 125 × 210 | View package and request a quote |
| Formlabs Fuse 1+ 30W | SLS | 165 × 165 × 300 | View package and request a quote |
FDM dimensions: Bambu Lab P2S specifications and Prusa CORE One+ specifications. Formlabs dimensions are sourced above. Build volume is a machine limit, not a promise that every part occupying that volume can print: orientation, supports, clearance and the material profile also matter.
Use one real part to compare the full workflow
- Record the job: dimensions, quantity, deadline, fit requirements, appearance, temperature and expected loading.
- Shortlist a process and material: choose based on the part's requirements, then check exact machine compatibility.
- Review the prepared build: orientation, supports or powder access, material use and the estimated print time.
- Include the finishing work: operator time, cleaning equipment, consumables and any required curing.
- Compare finished usable parts: inspect a representative result against your requirements before committing to a production workflow.
For a one-off part or an uncertain design, start with NEX3D Print on Demand and review the available process choices in the quote tool. For a printer purchase, use the printer finder or contact NEX3D with the requirements above. Linked product pages show current CAD pricing and whether a configuration can be purchased directly or needs a quote.