FDM vs Resin 3D Printers: Which Should You Buy?

FDM and resin are the two main ways to 3D print at home. An FDM printer melts plastic filament and draws each layer. A resin printer uses light to harden liquid resin, one layer at a time. This is a research-based comparison built from maker and engineering documentation. It has not been tested side by side by us, and the figures are typical ranges, not measurements of any one printer.

The short answer

• Pick FDM if you want functional parts, bigger prints, cheap materials and the least mess. It is also the better first printer for most people.
• Pick resin if your main goal is small, highly detailed models such as miniatures, with smooth surfaces straight off the printer, and you have a ventilated space to work in.
• Not sure? Start with FDM. It has a gentler learning curve and fewer safety steps. Our first printer checklist walks through the wider decision.

How each technology works

FDM (fused deposition modeling, also called FFF) feeds thermoplastic filament through a heated nozzle and lays it down in layers. Protolabs describes it as simple and cost-effective, and a favorite of both hobbyists and professionals. Common filaments include PLA, PETG, ABS and nylon. If you are new to the materials, start with PETG vs PLA.

Resin printing uses a photopolymer: a liquid that solidifies when exposed to UV light. Prusa notes that resins are cured by UV light, which includes sunlight, and that they are used on DLP, SLA and MSLA printers. Unlike filament, there is no wide family of materials such as PLA or PETG. Prusa describes it as one base resin that can be enhanced with colors or additives such as ones that add hardness or toughness. For a deeper primer, see what resin 3D printing is.

FDM vs resin side by side

The figures below come from the Protolabs Network comparison of FDM and SLA. SLA there means resin printing in general. Treat them as typical ranges: individual printers vary.

Detail and surface quality

This is where resin earns its place. Layers of 0.025 to 0.05 mm are thinner than the typical FDM range of 0.1 to 0.4 mm, and Protolabs says resin parts look good straight off the printer. FDM parts show layer lines, and while settings and finishing can improve them, a miniature printed in resin will usually show finer features. If you want to understand what layer height does on FDM, read the guide to layer height.

Strength and durability

FDM has the advantage for parts that must survive use. Protolabs lists FDM as durable and suited to functional parts, and notes that resins can be less impact-resistant. Specialized tough and high-temperature resins narrow the gap, but they are a specific choice, not the default. For brackets, clips, enclosures and tools, filament is the usual route.

Build size and speed

Typical desktop FDM printers offer more room than typical desktop resin printers, per the Protolabs ranges above. Protolabs also says SLA parts may need to be split and assembled when they exceed the build size. FDM is generally quicker for larger parts, while resin can be slow when you need high resolution.

Cleanup, workflow and safety

The biggest day-to-day difference is what happens after the print finishes. FDM prints are ready once supports are removed. Resin prints need supports removed, cleaning and UV curing, which Protolabs says adds steps and lead time. Our guide to washing and curing resin prints covers the sequence.

Safety is the other difference, and it matters more than the spec sheet. Prusa's resin guidance says to wear gloves to avoid skin contact, recommends a simple respirator, and says to keep resin out of the reach of children and pets. Its longer resin safety article advises working in a well-ventilated room, using disposable gloves and protective eyewear, and following the safety data sheet for your specific resin. It also notes that some gloves can be partly dissolved by isopropanol, so check glove compatibility with the cleaning liquid.

FDM has its own cautions, mainly hot surfaces and moving parts, but it does not involve handling liquid chemicals. If a shared home, a small workspace or children and pets are a concern, that points toward FDM.

Cost: what to check

Prices change often, so check current listings rather than relying on a figure here. The cost comparison has more parts than the printer price:

• Printer: both types have entry-level options. Protolabs notes resin machines can also be inexpensive.
• Materials: Protolabs describes FDM as lower material cost and resin as higher material and processing cost.
• Extras: resin adds gloves, cleaning liquid, wash and cure equipment and disposal. FDM may add a filament dryer, spare nozzles and a build plate.

For the filament side, see 3D printer running costs and the print cost calculator.

Choose FDM if / choose resin if

Many makers end up with both. Protolabs notes that engineers combine the two, using FDM for structural parts and SLA for detailed, aesthetic ones. If you are leaning toward resin, see our shortlist of best resin 3D printers.