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Filament or resin: which 3D printer should you actually buy

Author Redacción TRIDYsign

Published · Updated

5 min read

Choose filament (FDM) if you want functional parts, medium or large objects, and the ability to start printing the day the box arrives; choose resin (MSLA) if your goal is fine detail on small parts, such as miniatures, jewellery or dental models. The detail gap is geometric rather than marketing: a standard FDM nozzle is 0.4 mm, or 400 microns, while Elegoo publishes a 19 x 24 µm pixel for the Saturn 4 Ultra and Anycubic publishes 16.8 x 24.8 µm for the Photon Mono M7. The deciding difference, though, is post-processing: an FDM part comes off the plate ready to use, while a resin part must be washed, cured and its chemical waste disposed of, with gloves on, every single time. Formlabs recommends nitrile or neoprene gloves, safety glasses and a space with at least three air changes per hour. Standard resins are also more brittle and degrade under UV.

  • Resin wins on detail because of geometry, not marketing: manufacturers publish pixel sizes around 19 x 24 µm or 16.8 x 24.8 µm, against a typical 400 µm FDM nozzle.
  • FDM wins on functional parts: standard resin is more brittle and degrades under UV, so anything load-bearing or outdoors is filament work.
  • The real cost of resin is not the bottle: it is isopropyl alcohol, nitrile gloves, paper towels, the FEP film in the vat and the time spent washing and curing.
  • Formlabs recommends nitrile or neoprene gloves and a space with at least three air changes per hour for resin work. That is not optional advice.
  • For a first machine in a shared home with children or pets, the answer is almost always filament.
  • Plenty of experienced users end up with both: FDM for prototypes and useful parts, resin for anything viewed up close.

It is the first real decision, and most people make it backwards — by looking at photos of resin miniatures. The photos are not lying, but they tell half the story. The other half is the nitrile glove, the litre of alcohol and the waste container.

How does each technology work?

Filament (FDM). A motor pushes plastic into a hot end and a nozzle lays it down layer by layer. The standard nozzle is diameter0.4 mm — 400 microns. Every horizontal detail you can produce is bounded by that line width.

Resin (MSLA). An LCD projects a UV image into a vat of liquid resin; exposed resin solidifies and the platform lifts one layer. Horizontal resolution is the pixel size of that screen. Elegoo publishes 19 x 24 µm for the Saturn 4 Ultra; Anycubic publishes 16.8 x 24.8 µm for the Photon Mono M7. Between 400 microns and 20 microns there is a factor of twenty. That is the entire detail difference, and it is not a matter of opinion.

The comparison that matters

Filament (FDM)Resin (MSLA)
Fine detailGood, bounded by the nozzleExceptional
Functional partsIts home turfBrittle in standard resins
Part size220–350 mm per side is commonSmaller; Elegoo lists 218.88 x 122.88 x 220 mm on the Saturn 4 Ultra
ConsumablesFilament spoolResin, alcohol, gloves, towels, vat film
Post-processingRemove supportsWash, cure, remove supports, dispose of waste
Protective equipmentNone for PLANitrile or neoprene gloves, eye protection, ventilation
Where it can liveAny ventilated deskA dedicated area, away from children and pets
Learning curveLevelling and first layerExposure times and support orientation

Choose filament if…

  • You want to print things that get used: organisers, brackets, replacement parts, boxes, prototypes, mechanism components.
  • You want medium or large objects in one piece.
  • The printer will live in a shared space with family or pets.
  • You want to start the day it arrives, without setting up a chemical work area.
  • Material variety appeals to you: PLA for most things, PETG for outdoors and moisture, flexible TPU, ABS or ASA where heat is involved. Prusa Research states that PLA and PETG do not require an enclosure, while ABS and ASA do recommend one.

Choose resin if…

  • Your goal is detail: wargaming miniatures, collectible figures, jewellery, dental models, presentation prototypes.
  • Parts are small and will not carry load.
  • You have a space you can dedicate: a ventilated bench, not the dining table.
  • You accept a three-step routine after every single print.

Which is cheaper to run?

With filament, the spool is the consumable and that is it. With resin the list is longer: isopropyl alcohol that saturates and must be replaced, single-use gloves, industrial quantities of paper towel, the FEP or nFEP film at the bottom of the vat, and time — every print adds washing and curing before you can touch it barehanded.

We are not saying resin is expensive. We are saying its cost is not in the bottle. Comparing price per litre against price per kilogram is the wrong comparison.

Can I print miniatures on a filament printer?

The honest answer: for 28–32 mm figures, resin is still a different category. With a 0.2 mm FDM nozzle and good calibration the results are impressive, and for vehicles or terrain FDM is fully competitive. But on a six-millimetre face, the gap between 20 and 200 microns is visible without magnification.

The combination many tabletop hobbyists land on: resin for figures, filament for terrain and storage. That is not indecision, it is using the right tool.

How do you decide in thirty seconds?

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    Write down the first three things you want to print

    Not what you imagine a year from now. The first three. Be specific.

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    Mark each one as 'looked at' or 'used'

    A figure, a bust or a piece of jewellery is looked at. A bracket, a box or a gear is used.

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    If two of three are 'used', buy filament

    Resin does not solve a functional part better and it charges you post-processing on every print.

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    If two of three are 'looked at', check you can set up the work area

    If you have nowhere ventilated and out of reach of children, the answer is filament for now. Resin is not dangerous when handled properly — but it must be handled properly every day.

What if the answer is "both"?

That is a common ending and there is nothing wrong with it. The order people regret least is filament first: it teaches slicing, orientation, supports and calibration using a forgiving material and no chemicals. Once those are automatic, resin takes a weekend to learn and is far more enjoyable.

If you have decided, continue with the beginner filament shortlist.

Frequently asked questions

Is resin or filament better for 3D printing?
Neither is better in the abstract. Resin solves fine detail on small parts; filament solves functional, medium and large parts with far less post-processing and no chemical handling.
Is resin printing more dangerous than filament?
It demands more precautions. Liquid resin irritates skin and eyes and requires nitrile or neoprene gloves, ventilation and controlled disposal. PLA filament, by comparison, needs no protective equipment to handle.
Do resin parts break easily?
Standard resins tend to be more brittle than PLA or PETG, and prolonged sunlight degrades them. Tougher formulations exist, but they cost more and complicate curing.

Sources

  1. [1]Safety with Formlabs resin productsFormlabs · Manufacturer · accessed July 27, 2026
  2. [2]Filament material guide (temperatures and enclosure recommendations)Prusa Research · Manufacturer · accessed July 27, 2026
  3. [3]Elegoo Saturn 4 Ultra (12K) — product pageElegoo · Manufacturer · accessed July 27, 2026
  4. [4]Anycubic Photon Mono M7 — official wikiAnycubic · Manufacturer · accessed July 27, 2026
  5. [5]Formlabs Form 4 — product pageFormlabs · Manufacturer · accessed July 27, 2026
Update history (2)
  1. Added the post-processing table and the pixel sizes published by Elegoo and Anycubic.
  2. Initial publication with the use-case comparison and the resin safety block.

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