Step 1: FDM or resin?
FDM melts plastic filament through a nozzle. It is clean, versatile and best for functional parts and bigger objects. Resin (MSLA) cures liquid resin with a masked UV screen; it's far more detailed but messy and chemical. Most people should start with FDM; miniature painters with resin. See resin for beginners.
Step 2: open or enclosed?
Open printers are cheaper and fine for PLA and PETG. Enclosed printers are needed for ABS, ASA and other warp-prone materials. Heated chambers go further for engineering materials. Details in the best enclosed printers.
Step 3: how big?
| Build volume | Typical models | Suits |
|---|---|---|
| ~180 mm cube | A1 mini | Small desks, toys, gadgets |
| ~256 mm cube | A1, P1S, P2S | Most people |
| 300–350 mm | H2D, K2 Plus | Helmets, armor, large parts |
Step 4: one color or many?
Multicolor units (AMS, CFS, MMU3) swap filaments automatically. They add cost, purge waste and print time, but also unlock multi-material prints. See the best multicolor printers.
Specs that matter (and ones that don't)
- Matters: automatic calibration, build volume, enclosure, max nozzle temperature (for materials), extruder type, ecosystem and parts availability.
- Matters less: top speed headlines, "AI" labels on cameras, resolution "K" numbers on resin printers (compare pixel size in µm instead).
Glossary
- Bed-slinger: printer whose bed moves on the Y axis.
- CoreXY: kinematics where two motors move the toolhead in X and Y together.
- Hotend / nozzle: the part that melts and extrudes filament; 0.4 mm is the standard nozzle.
- Direct drive: extruder mounted on the toolhead; better for flexible filament.
- Z-offset: the gap between the nozzle and bed at the first layer.
- Pressure advance / flow calibration: compensation for pressure in the nozzle, for crisper corners.
- Input shaping / resonance calibration: cancels vibrations to allow higher speeds without ringing.
- Purge / flush: filament wasted when changing colors.
- MSLA: masked stereolithography, the common LCD resin technology.
- Tilt release: resin vat tilts to peel each layer gently.
- FEP / release film: the transparent film at the bottom of a resin vat.
Frequently asked questions
Does top speed matter on a 3D printer?
Less than marketing suggests. Real print time depends on acceleration, the hotend's maximum flow rate, cooling and the material. A printer that quotes 600 mm/s rarely sustains it on real parts.
What is the difference between CoreXY and a bed-slinger?
On a bed-slinger the bed moves back and forth (Y axis), which is simple and affordable but moves the print itself. On CoreXY, the toolhead moves in X and Y and the bed only moves down, which suits fast and tall prints and fits neatly in an enclosure.
Should I buy a used 3D printer?
It can be good value for well-supported models with available parts. Check the hotend, belts, bed surface and firmware support, and prefer brands with strong spare-parts availability.