Best Filament for Beginners: What to Buy First

The first filament purchase is the one most likely to be made badly, because it is made before there is any basis for judging. The good news is that the correct answer is narrow. For a first spool on a consumer FDM printer, the material is PLA, and almost everything else on the order page is a detail that matters less than people expect.

This guide covers what to buy, how much of it, and which spool specifications are worth reading before you click.

Start with PLA, and do not overthink it

Prusa’s material documentation describes PLA as one of the easiest materials to print, inexpensive, and suitable for beginners, with a recommended nozzle temperature of 215 °C for the first layer and 210 °C afterwards and a bed at 60 °C. It notes that PLA does not require a heated bed at all and is not prone to significant warping.

Those two properties are the whole argument. Warping is what turns a first print into a curled, detached mess, and PLA warps less than any other common filament. A material that tolerates a cold bed, low nozzle temperatures and an open-frame printer removes most of the variables at once, which means that when a print does fail, the cause is something you can actually find.

PLA’s weaknesses are real but mostly irrelevant to a first spool. The Prusa documentation is blunt about them: PLA gets soft and deforms above roughly 60 °C, it degrades under UV light, its layer adhesion is weaker than other materials, and it breaks along layers or into shards on impact. A bracket in a hot car is the wrong job for it. A benchy, a bin clip, a prototype, or a desk organiser is exactly the right job.

The second spool: PETG, once the printer is calibrated

PETG is the natural next step and, per Prusa’s documentation, is also inexpensive and suitable for beginners, with relatively high tenacity and temperature resistance that make it appropriate for technical parts. Prusa notes that parts of its own printers are made from PETG, that it does not shrink or warp because its thermal expansion is very low, and that parts are usable in exterior conditions below about 80 °C.

The catch is print surface, not print difficulty. Prusa recommends a powder-coated textured or satin sheet for PETG and warns that printing it on a smooth PEI surface can damage the sheet, because PETG bonds to smooth PEI far too well. Buying a spool of PETG before checking what build surface the printer shipped with is how people destroy an expensive sheet on their third print.

PETG also runs hotter: 230 °C for the first layer and 240 °C afterwards, with a bed at 85 °C for the first layer and 90 °C after. A printer that cannot reach a 90 °C bed is a printer that will struggle with it.

For a fuller side-by-side, including where ABS fits, see the comparison of PLA, PETG and ABS by print temperature, warping and enclosure requirements.

What to skip on the first order

Three material families look tempting on a store page and are the wrong first purchase.

Flexible filament (TPU, TPE). Prusa’s documentation recommends flexible filaments for experienced makers only, citing frequent nozzle clogging, poor bridging and overhang behaviour, and filament tangling, and notes that the softer the filament, the harder it is to print. It is also one of the most moisture-sensitive materials on the shelf.

ABS and ASA. Both need an enclosure and ventilation. Prusa lists “requires printer enclosure” and “potentially dangerous fumes (styrene)” as headline drawbacks of ABS, and describes significant warping for both. Neither belongs on an open-frame printer in a bedroom.

Nylon and composites. Prusa describes polyamide as very hard to print and recommended for experienced users only, and notes it is hygroscopic enough that improper storage lets it absorb water weighing up to 10% of the filament weight. That is a material that punishes storage mistakes before it punishes print settings.

Diameter is a compatibility check, not a preference

Filament comes in 1.75 mm and 2.85 mm nominal diameters. This is not a quality decision or a price decision. It is a compatibility decision made by whoever designed the extruder, and buying the wrong one produces a spool that physically cannot be fed.

Nearly every current consumer printer takes 1.75 mm. Check the printer’s specification page before ordering rather than assuming, particularly when buying from a marketplace listing where the diameter is buried in a variant selector. A cheap spool in the wrong diameter is not a bargain.

How much to buy

The standard consumer spool holds 1 kg of filament by net weight. At the 1.24 g/cm³ density Prusa publishes for Prusament PLA, that kilogram of 1.75 mm filament is roughly 335 metres. Polymaker publishes 1.17 g/cm³ for PolyLite PLA, which is roughly 355 metres for the same kilogram, so the brand moves the answer by about 20 m before anything is printed. Most beginner prints consume single-digit metres either way, so one spool covers a great deal of learning.

Buy one spool of one colour first. The common failure pattern is ordering five colours before the printer has produced a single good part, then discovering that four of them have been sitting in a humid room for two months. The material has a storage clock on it from the moment the vacuum bag is opened, which is the subject of the next section.

To turn a spool weight into remaining metres for any material, the site’s filament weight and length calculator does the conversion, and how density converts spool weight into printable length explains why the number changes between materials.

Spool details that are worth reading

Most listing specifications are noise. Four are not.

Net weight versus gross weight. Specification sheets quote net filament weight, but the object that arrives includes the spool, and the spool is not light. Prusa publishes the parts list for its own: two injection-moulded flanges at 81.5 g each plus a 39.5 g cardboard centre tube, so about 202 g of the 1.2 kg on the scale is not filament. Empty spool weight varies widely between vendors and between cardboard and plastic construction. If the tare is printed on the spool, that number lets you weigh a partly used spool and know what is left; if it is not, weighing one spool after it runs out gives you the figure for that brand permanently.

Spool dimensions. Bambu Lab’s documentation gives its reusable spool as 200 mm outer diameter and 67 mm height and notes that a drying oven needs at least 250 mm of depth and width to take one. The same dimensional check applies to dry boxes, automatic material systems and spool holders. An oversized spool that will not fit the storage you own is a spool you cannot keep dry.

Vacuum bag and desiccant included. A spool that ships sealed with fresh desiccant arrives dry. One that ships loose in a cardboard box has already been absorbing water for however long it sat in a warehouse.

Diameter tolerance. Published as a figure like ±0.02 mm. It matters for consistent extrusion, but it matters far less than every beginner forum thread suggests, and it is not worth paying a large premium for on a first spool.

Storage starts on day one, not when problems appear

Bambu Lab’s filament documentation puts numbers on this. Typical indoor relative humidity sits between 45% and 65% RH and goes higher in humid weather. Most filaments only stay dry in an environment below 20% RH, and in such an environment they remain dry for roughly two to seven days depending on the material. In a typical indoor environment around 55% RH, freshly dried filament absorbs enough moisture to affect print quality within two to twelve hours, depending on how hygroscopic the type is.

The practical reading of those figures is that an opened spool left on an open shelf is not being stored, it is being exposed. A sealed container with fresh desiccant, or a dry box the filament feeds directly out of, is the cheapest print-quality upgrade available to a beginner. When a spool does get wet, drying temperatures and times by filament type covers the recovery, but prevention costs almost nothing by comparison.

A first-purchase checklist

• One 1 kg spool of PLA, in the diameter the printer’s specification page states.
• Confirm the build surface suits the material before adding PETG to the order.
• A sealed container sized for the spool, plus desiccant that changes colour when saturated.
• Skip flexible, ABS, ASA, nylon and composite filaments entirely for now.
• Note the tare weight from the spool label, or weigh the empty spool later and record it.

Common first-spool mistakes

Ordering by colour range rather than by material. Buying 2.85 mm filament for a 1.75 mm printer because the listing was cheaper. Assuming a sealed bag stays a dry environment after it has been opened and resealed with exhausted desiccant. Treating extrusion defects from a wet spool as a printer fault and recalibrating the machine repeatedly. Paying a premium for tight diameter tolerance while storing the spool on an open shelf in a garage.