Best Filament for the Prusa XL and XL+ (2026)

Quick picks

These are defaults by need, not a ranking.

Who this page is for

This page is for owners of an Original Prusa XL or a Prusa XL+, with one toolhead or up to five, who want to know which spools suit the printer before buying. The XL takes 1.75 mm filament, and every spool here is 1.75 mm. For nozzles and print sheets that fit the XL, see the Prusa XL printer page.

The table is grouped by job, not ranked.

What can the XL print, per Prusa?

Limits. Prusa's XL+ specifications list a 360 × 360 × 360 mm (46.7 l) build volume, a 290 °C maximum nozzle temperature, and a "Segmented, 16 individually controlled tiles, up to 115 °C" heatbed. The model cards on the same page list a 120 °C heatbed for the XL+, and the comparison table lists 290 °C and 120 °C for the Original Prusa XL. We use the lower 115 °C figure, so every spool here has a published bed range at or below 115 °C and a nozzle range that tops out at 290 °C or lower.

Open frame. The comparison table lists the Original Prusa XL's chamber as "No (optional Enclosure as a separate add-on)." The XL+ specifications list "PLA, PETG, ASA, ABS, PC, PA (nylon), TPU, PVA, HIPS, PP, CPE, PVB, carbon-fiber composites," and Prusa's FAQ answers whether you need an enclosure with: "Not for PLA and PETG - most people start there." It suggests an enclosure "when you want large ASA or ABS parts."

Brass nozzle. The comparison table lists the Original Prusa XL's provided nozzle as "Prusa Nozzle brass 0.4 mm." The XL+ page says it ships with "High‑Flow Nozzles" without naming the material, but Prusa's nozzle guide says "The Prusa FFF printers are equipped with a brass nozzle." So assume brass unless you've changed it.

Print sheet. Prusa lists a satin sheet as standard on both versions. That matters for PETG, below.

Which filaments warp least on the XL's big bed?

The XL's size is the reason to buy it, and it's also where warping shows up. Prusa says the segmented heatbed "provides more even & reliable heating," but its material guides still put the burden on the material and the air around it.

• PLA. Prusament's PLA page calls PLA "the perfect choice for printing large objects thanks to its low thermal expansion (with little to no warping)."
• PETG. Prusament's PETG page says "even when printing big objects, and without an enclosure, it rarely lifts from the bed and warps."
• ASA. Prusament's ASA page lists "Large models have a tendency to warp" as a con, and says "Even with the heatbed set to 110°C, the prints can shrink and warp." It says an enclosure or a tall skirt can eliminate this. Prusa's ASA guide adds "An enclosure is necessary for printing large parts."
• ABS. Prusa's ABS guide recommends a 100 °C bed, adjustable "between 80 to 110 °C depending on the size of an object (larger object means higher temperature)," and lists "Requires printer enclosure" as a con.

So for full-plate prints on an open XL, PLA and PETG are the safe choices. ASA and ABS are for an enclosed XL. Our PLA vs ASA guide covers when a part needs ASA at all.

Multi-tool XL: mixing materials and soluble supports

Prusa sells the XL with one, two or five toolheads, and says you can start with one and add more later with an upgrade kit. Its product page says the XL+ can "Combine rigid and flexible materials with soluble filaments," and that "Each toolhead keeps its own nozzle." That second point matters for filled spools: a wear-resistant nozzle only protects the toolhead it's fitted to.

Prusa's Knowledge Base says the XL multi-tool can use water-soluble PVA+ and BVOH for supports or just the support interface, and calls it "a process more suitable for advanced users." Its rules:

• The main material and the soluble support "must have similar melting/printing temperatures."
• "For PETG you can practically only use BVOH. PLA can be printed with both PVA+ and BVOH."
• For ABS, Prusa says the best soluble option is HIPS, dissolved with limonene, and asks you to read up on its health and safety considerations.
• PVA+ and BVOH "adhere poorly" to smooth PEI or textured sheets, so Prusa recommends its SOLUBLE INTERFACE preset when supports touch the build plate.
• Both are very hygroscopic. Prusa says the best approach is to print and store them in a drybox.

We don't list a soluble spool here, because none in our catalog has been checked yet. Use the main-material picks below and follow Prusa's pairing rules.

Everyday PLA

Prusament PLA (Jet Black, 1 kg)

Prusament is Prusa's own filament brand, and Prusa ships a 1 kg spool of it in the XL+ box. Prusa's material page lists a 210 ± 10 °C nozzle, a 40–60 °C bed, "Enclosure not required," and a temperature resistance of 55 °C. It also says PLA is "not ideal for outdoor use." Prusa lists "Low warping" among its pros and "Brittle" among its cons.

Prusa Research

Prusa Research Prusament PLA (Jet Black, 1.75 mm, 1 kg)

Best for

Precise everyday PLA prints, especially on Prusa printers with stock profiles.

Skip this if

The part needs heat, UV, or mechanical-stress resistance.

Specs, strengths, and limitations

Material

PLA

Diameter

1.75 mm

Net filament

1000 g (filament only, not packaged weight)

Format

plastic spool

Maker's nozzle range

200–220 °C

Strengths

• Manufacturer states diameter precision of ±0.02 mm and publishes measured data for every spool.
• Manufacturer states low warping, suitable for large prints.
• Manufacturer states guaranteed color consistency between batches.

Limitations

• Not suited to heat or outdoor use: Prusa lists 55 °C temperature resistance and low UV resistance.
• Prusa suggests PETG or PC Blend for mechanically stressed parts, and lists PLA as difficult to sand.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

Skip it if the part will see heat, sun or repeated bending.

Polymaker PolyLite PLA (Black, 1 kg)

PolyLite PLA is a non-Prusament alternative that, like Prusament, needs no enclosure on an open XL. Its TDS (V5.4) lists a 190–230 °C nozzle, a 25–60 °C bed, "Closure Chamber: No Needed," and a heat deflection temperature of 58 °C at 1.8 MPa. It ships on a cardboard spool.

Polymaker

Polymaker PolyLite PLA (Black, 1.75 mm, 1 kg)

Best for

Everyday PLA prints, prototypes, and display models where a documented, easy-printing PLA is wanted.

Skip this if

The part will sit in a hot car, near heat sources, or needs toughness beyond standard PLA.

Specs, strengths, and limitations

Material

PLA

Diameter

1.75 mm

Net filament

1000 g (filament only, not packaged weight)

Format

cardboard spool

Maker's nozzle range

190–230 °C

Strengths

• Manufacturer states PolyLite PLA is designed for reliability and ease of printing.
• Manufacturer TDS lists no enclosure needed and a wide 190–230 °C nozzle window.
• Manufacturer publishes a full TDS with mechanical, thermal, and drying data.

Limitations

• Not suited to parts exposed to heat: the TDS lists a heat deflection temperature of 58 °C (1.8 MPa).
• Cardboard spool: Polymaker says its spools have hardened edges that work in the AMS, but Bambu Lab's general AMS guidance recommends an adapter or ring for cardboard spools. Check your unit.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

Skip it if the part will see heat, or you'd rather stay with Prusa's own filament.

Polymaker PolyLite PLA Pro (Black, 1 kg)

PolyLite PLA Pro is Polymaker's toughened PLA, for large household parts and prototypes that may get knocked about. Its TDS lists a 190–230 °C nozzle, a 30–60 °C bed, no closed chamber needed, and a heat deflection temperature of 58 °C at 1.8 MPa. So it still has PLA's heat limit.

Polymaker

Polymaker PolyLite PLA Pro (Black, 1.75 mm, 1 kg)

Best for

Functional PLA parts, props, and prototypes that need more drop resistance than standard PLA.

Skip this if

The part will see heat above about 55 °C (TDS HDT 58 °C at 1.8 MPa) or needs to flex.

Specs, strengths, and limitations

Material

PLA (PLA Pro (toughened PLA))

Diameter

1.75 mm

Net filament

1000 g (filament only, not packaged weight)

Format

cardboard spool

Maker's nozzle range

190–230 °C

Strengths

• Manufacturer states it combines high toughness and high rigidity with the ease of printing of regular PLA.
• TDS lists notched Charpy impact strength of 17.1 kJ/m² (X-Y).
• Manufacturer publishes a full TDS with mechanical, thermal, and drying data.

Limitations

• Not for heat: the TDS lists a heat deflection temperature of 58 °C (1.8 MPa), and Polymaker says it is not for projects needing high heat resistance or flexibility.
• Cardboard spool: Bambu Lab strongly advises a spool adapter or adapter ring for cardboard spools in the AMS.
• Polymaker now calls this the 'Old Formula' and sells a separate 'New Formula' Polymaker PLA Pro; check which version an Amazon listing ships.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

Skip it if the part will sit somewhere warm or needs to flex.

PETG for functional parts

Prusa's PETG guide says "Using powder-coated TXT or satin sheet is highly recommended," and warns, "Do not print on the smooth PEI sheet as the adhesion may be too strong!" The XL's standard satin sheet suits PETG. The same guide calls PETG suitable for interior and most exterior use "with temperatures below 80 °C." PETG is also the main material Prusa pairs with BVOH supports.

Prusament PETG (Jet Black, 1 kg)

Prusament PETG is Prusa's own PETG. Its TDS lists a 250 ± 10 °C nozzle and an 80 ± 10 °C heatbed, with satin, powder-coated or smooth PEI (with glue stick) sheets, and a heat deflection temperature of 68 °C at 0.45 MPa. Prusa's material page warns of "Strong adhesion to the bed - be careful when you're removing the print," and lists possible stringing as a con.

Prusa Research

Prusa Research Prusament PETG (Jet Black, 1.75 mm, 1 kg)

Best for

Functional parts, brackets, and larger prints that need more toughness than PLA.

Skip this if

The part needs heat resistance above about 68 °C (TDS HDT at 0.45 and 1.8 MPa), or you want a matte finish that hides layer lines.

Specs, strengths, and limitations

Material

PETG

Diameter

1.75 mm

Net filament

1000 g (filament only, not packaged weight)

Format

plastic spool

Maker's nozzle range

240–260 °C

Strengths

• Manufacturer states high strength and durability with low shrinking and warping.
• Manufacturer states diameter precision of ±0.02 mm and publishes measured data for every spool.
• Manufacturer states it is easier to sand than PLA.

Limitations

• Prusa lists possible stringing that may require occasional drying, and poor bridging.
• Strong bed adhesion: Prusa warns to take care removing prints, recommends textured, satin or PP sheets, and says to avoid smooth PEI (glue stick if used).
• Heat resistance tops out around 68 °C: the TDS gives HDT 68 °C at both 0.45 and 1.8 MPa.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

Skip it if the part needs more heat resistance than PETG offers.

Polymaker PETG (Black, 1 kg)

Polymaker's current PETG is a high-flow formula. Its TDS (V3.0) lists a 240–260 °C nozzle, a 60–70 °C bed, speeds up to 300 mm/s, and "Closure chamber: Not Needed." It recommends drying at 60 °C for 6 hours. It ships on a cardboard spool.

Polymaker

Polymaker PETG (Black, 1.75 mm, 1 kg (new formula))

Best for

Functional brackets and fixtures, indoors or in shade, that need more toughness than PLA.

Skip this if

You can't keep filament dry, or the part needs heat resistance well above 65 °C (TDS HDT at 1.8 MPa).

Specs, strengths, and limitations

Material

PETG (high-flow)

Diameter

1.75 mm

Net filament

1000 g (filament only, not packaged weight)

Format

cardboard spool

Maker's nozzle range

240–260 °C

Strengths

• Manufacturer states it is less brittle and more impact-resistant than PLA.
• Manufacturer states it prints without an enclosure and works with AMS and multi-material systems.
• Manufacturer states a high-flow formulation for speeds up to 300 mm/s with a 0.4 mm nozzle.

Limitations

• Moisture-sensitive: the TDS recommends drying at 60 °C for 6 h and printing from a dry box.
• Heat resistance is limited: the TDS lists HDT 65 °C at 1.8 MPa (69 °C at 0.45 MPa).
• Cardboard spool: Polymaker says its spools have hardened edges that work in the AMS, but Bambu Lab's general AMS guidance recommends an adapter or ring for cardboard spools. Check your unit.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

Skip it if you can't keep filament dry.

TPU for flexible parts

Prusa's flexible materials guide says "the softer the filament is, the harder it is to print," and recommends keeping flexible filament dry. For the XL specifically, it says "The Original Prusa XL has a long path from the loading to the extruder nozzle," so flexible filament needs special attention when loading, and it points to a printable flex filament bypass. On a multi-tool XL, Prusa's product page names "Flexible TPU joints + durable polycarbonate in one automated run" as one use. Our TPU compatibility guide explains hardness grades.

Polymaker PolyFlex TPU95 (Black, 0.75 kg)

PolyFlex TPU95's TDS (V5.4) lists Shore 95A, the firmer end of common TPU, with a 210–230 °C nozzle, a 25–60 °C bed, 30–50 mm/s printing, no closed chamber needed, and drying at 70 °C for 8 hours. The spool holds 0.75 kg on cardboard.

Polymaker

Polymaker PolyFlex TPU95 (Black, 1.75 mm, 0.75 kg)

Best for

Flexible covers, grips, bumpers, and seals on printers that handle 95A TPU.

Skip this if

You need a softer TPU than 95A, or fast print times, or your printer is set up as Bowden and you can't print very slowly (Polymaker highly recommends direct drive and says Bowden is possible only at very slow speeds).

Specs, strengths, and limitations

Material

TPU

Diameter

1.75 mm

Net filament

750 g (filament only, not packaged weight)

Hardness

95A

Format

cardboard spool

Maker's nozzle range

210–230 °C

Strengths

• Manufacturer states it is engineered to work on most desktop 3D printers without specialized hardware.
• Manufacturer states it can stretch over three times its original length.
• Manufacturer TDS lists shore hardness 95A and no enclosure needed.

Limitations

• Slow printing: the TDS recommends 30–50 mm/s.
• Spool holds 0.75 kg, not 1 kg.
• Cardboard spool: Polymaker says it redesigned its spool edges to spin well in the AMS, but its Flexible TPU FAQ says TPU is often too soft to feed through the AMS and suggests avoiding it. Bambu Lab also advises against TPU in the AMS and recommends an adapter or ring for cardboard spools.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

Skip it if you want a 1 kg spool or a softer TPU.

ASA and ABS: enclose the XL first

Prusa's ASA guide says "the bed should be heated to at least 100 °C, and the printer should be inside an enclosure to keep a higher ambient temperature." Its ABS guide recommends a 100 °C bed and lists "Requires printer enclosure" as a con. Both warn that the material releases fumes and substances that could pose a potential health risk, and both say to print in a well-ventilated room without creating a draft around the print. For the wider picture, see the ASA filament shortlist and our ABS filament shortlist.

Original Prusa XL Enclosure (kit)

Prusa says this enclosure "seamlessly integrates with the Original Prusa XL" and makes advanced materials "(PCCF, Nylon, PP, ASA, and more) much easier." It connects to the XL's mainboard, so the printer controls its HEPA filter, which Prusa rates at 99.9% efficiency. Prusa says the filter "helps to reduce odors and prevents the spread of ultra-fine particles." It's passive, with "heating provided only by the 3D printer's heatbed." For PLA, Prusa says a magnetic bellows cover folds open for "much better airflow," because "PLA perform[s] worse in high temperatures." It ships as a kit to assemble.

XL+ owners: check this first. Prusa's XL+ page sells a different "Enclosure for Prusa XL+" and says "The new Enclosure is compatible with the XL+ only!" Prusa's XL-to-XL+ upgrade page says an original XL Enclosure stays "fully compatible" after the upgrade, but "it won't reach 50°C like the new one." Our fit record for this kit covers the Original Prusa XL only, so if you're buying an enclosure for an XL+, get Prusa's XL+ enclosure instead. Our printer enclosure shortlist covers enclosures for other printers.

Prusa Research

Prusa Research Original Prusa XL Enclosure (Kit (shipped disassembled), with HEPA filtration, temperature sensor, and LED strip)

Best for

Original Prusa XL owners who print ASA, ABS, PC, or blends and want a maker-integrated enclosure with filtration.

Skip this if

You own any printer other than the Prusa XL, or you print only PLA and PETG.

Verified fit

Prusa Research XL (Original Prusa XL) (stock configuration, per the manufacturer)

Specs, strengths, and limitations

Outer size

700 × 720 × 900 mm

Maker notes

Prusa: 'Dimensions when installed on the printer: 700 mm (w) × 900 mm (h) × 720 mm (d)'; weight 15.7 kg; 'Enclosure type: Passive, heating provided only by the 3D printer's heatbed.' Prusa: the basic package contains frame parts, transparent side panels, top and bottom panels, a bellows cover set, mounting material, a printer frame brace, PCCF replacement parts for the XL printer, a temperature sensor, an LED strip, and documentation. It is shipped disassembled as a kit. Prusa: the enclosure connects directly to the XL mainboard, and the XL controls filtration through a HEPA filter (Prusa states 99.9% efficiency). Prusa's enclosure page names the 'Original Prusa XL', so only that revision is recorded. Prusa's XL to XL+ upgrade page (checked 2026-10-09) says an existing Original XL Enclosure stays 'fully compatible' after the upgrade but 'won't reach 50°C like the new one'; Prusa sells a separate Enclosure for Prusa XL+.

Strengths

• Manufacturer states it is designed for and integrates with the Original Prusa XL, connecting to its mainboard for filtration and LED control.
• Manufacturer states its Advanced Filtration System with a HEPA filter helps reduce odors and the spread of ultrafine particles.
• Manufacturer states the magnetic bellows cover folds open for better airflow when printing PLA.

Limitations

• Still not a substitute for room ventilation. Prusa says the HEPA filter helps reduce odors and ultrafine particles, not that it removes all emissions, so keep the room ventilated.
• Follow Prusa's guidance for the XL on enclosed operation and electronics heat. Prusa says heating is passive, from the heatbed only, and that the bellows cover folds open for better airflow because PLA performs worse in high temperatures.
• It is a kit you assemble yourself, and the listing names only the Original Prusa XL. For a new XL+, Prusa sells a separate Enclosure for Prusa XL+; Prusa says this one stays compatible after an XL to XL+ upgrade but won't reach 50 °C.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

Skip it if you're buying for an XL+, or you print only PLA, PETG and TPU.

Prusament ASA (Natural, 800 g)

Prusa's material page lists a 260 ± 5 °C nozzle (its data sheet gives 260 ± 10 °C), a 110 ± 5 °C bed and "Skirt or Enclosure Recommended." It calls the material "UV stable" and says it shows "no signs of deformation up to temperatures near 93 °C." Prusa recommends the satin sheet for ASA, and warns that powder-coated or smooth sheets can bond too strongly. The bed range tops out at 115 °C, the XL+'s listed maximum. The spool holds 800 g, and it's sold in Natural rather than black.

Prusament

Prusament ASA (Natural, 1.75 mm, 800 g)

Best for

Prusa owners and anyone who wants a thoroughly documented, UV-stable ASA for outdoor parts.

Skip this if

Your bed can't reach 110 °C or you print in an unventilated room.

Specs, strengths, and limitations

Material

ASA

Diameter

1.75 mm

Net filament

800 g (filament only, not packaged weight)

Format

other

Maker's nozzle range

250–270 °C

Strengths

• Manufacturer states ASA is UV stable and shows no deformation up to about 93 °C.
• Prusa publishes a full TDS and measures diameter along every spool.
• Manufacturer states it can be smoothed with acetone vapor and sanded wet or dry.

Limitations

• Spool holds 800 g, less than the 1 kg spools here.
• Needs a 110 °C bed, and Prusa recommends an enclosure or tall skirt to control warping.
• Prusa warns of styrene fumes and recommends ventilation or an enclosure with active filtration.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-07 against the manufacturer. Price and availability are on Amazon.

Skip it if your XL isn't enclosed, or you want a 1 kg spool.

Polymaker ASA (Black, 1 kg)

Polymaker's ASA TDS lists a 230–260 °C nozzle, a 75–95 °C build plate, "Closure chamber: Needed," and a heat deflection temperature of 100 °C at 1.8 MPa. It recommends drying at 70 °C for 7 hours. It ships on a cardboard spool.

Polymaker

Polymaker ASA (Black, 1.75 mm, 1 kg)

Best for

Outdoor and sun-exposed functional parts printed on an enclosed machine.

Skip this if

Your printer is open-frame or can't reach a 95 °C bed and 260 °C nozzle.

Specs, strengths, and limitations

Material

ASA

Diameter

1.75 mm

Net filament

1000 g (filament only, not packaged weight)

Format

cardboard spool

Maker's nozzle range

230–260 °C

Strengths

• Manufacturer states it is an alternative to ABS with improved weather and UV resistance.
• Manufacturer TDS lists a heat deflection temperature of 100 °C (1.8 MPa).
• Manufacturer states it prints with settings very similar to ABS.

Limitations

• Needs an enclosed printer per the TDS.
• Requires higher nozzle and bed temperatures (230–260 °C, 75–95 °C) than PLA or PETG.
• Cardboard spool: Bambu Lab strongly advises a spool adapter or adapter ring for cardboard spools in the AMS.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

Skip it if your XL isn't enclosed.

Polymaker PolyLite ABS (Black, 1 kg)

Polymaker says PolyLite ABS uses a bulk-polymerized resin with "significantly lower volatile content than traditional ABS," and recommends printing it "on an enclosed 3D printer." Its TDS (V5.5) lists a 245–265 °C nozzle, a 90–100 °C build plate, "Closure Chamber: Needed," and a heat deflection temperature of 98 °C at 1.8 MPa. It recommends drying at 70 °C for 6 hours. Polymaker's product page adds that models bigger than about 15–20 cm in any direction need an actively heated chamber (~70 °C+). Neither XL enclosure reaches that: Prusa lists the Original Prusa XL Enclosure as passive, and the XL+ enclosure at up to 50 °C, or 60 °C with its upcoming heater. Prusa's ABS guide says ABS parts can be smoothed with acetone vapor, but they turn yellowish and more brittle outdoors, so pick ASA for outdoor parts.

Polymaker

Polymaker PolyLite ABS (Black, 1.75 mm, 1 kg)

Best for

Heat-resistant functional parts, enclosures, and prototypes printed on an enclosed printer.

Skip this if

Your printer is open-frame or its bed can't reach 90 °C.

Specs, strengths, and limitations

Material

ABS

Diameter

1.75 mm

Net filament

1000 g (filament only, not packaged weight)

Format

cardboard spool

Maker's nozzle range

245–265 °C

Strengths

• Manufacturer states PolyLite ABS uses a bulk-polymerized ABS resin with significantly lower volatile content than traditional ABS, for minimal odor.
• TDS lists a heat deflection temperature of 98 °C at 1.8 MPa.
• Manufacturer publishes a full TDS with mechanical, thermal, and drying data.

Limitations

• TDS lists a closed chamber as 'Needed'. Polymaker's product page says a non-enclosed printer with a 90 °C bed and 260 °C nozzle can handle models smaller than fist size, larger prints need an enclosed printer (about 40–50 °C), and models over about 15–20 cm need a heated chamber (about 70 °C or more).
• Needs a 90–100 °C bed (TDS), so printers with low-temperature beds aren't suitable.
• Cardboard spool: Bambu Lab strongly advises a spool adapter or adapter ring for cardboard spools in the AMS.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

Skip it if your XL isn't enclosed, the part is bigger than about 15–20 cm, or it will live outdoors.

Can the XL print carbon fiber?

Prusa's nozzle guide says a brass nozzle "tends to wear too quickly" with abrasive filaments (our worn nozzle guide covers the signs), and that most abrasive materials are composites and plastics with additives. Its nozzle-size table marks wood- or metal-infused filaments and CF- or Kevlar-infused ABS as needing a hardened nozzle at 0.4 mm. On a multi-tool XL, fit the wear-resistant nozzle to each toolhead that will print a filled spool. Our replacement nozzle shortlist covers the options.

E3D ObXidian Prusa Nextruder Nozzle (0.4 mm)

E3D's product page names the XL among compatible printers, along with the MK3.9, MK3.9S, MK4, MK4S, CORE One and CORE One L. It doesn't name the XL+ separately. E3D lists a 300 °C maximum, which is above the XL's 290 °C hotend limit, so the hotend is the real cap. E3D says the coating gives "orders-of-magnitude higher durability for abrasive filaments like carbon fiber, glass fiber filled materials." It also warns that aggressive fillers, such as Polymaker's Fiberon PA612-CF, PA6-CF, PA6-GF and PA12-CF, can still cause significant wear, and that glow-in-the-dark filaments contain a very hard additive. Some filled materials can jam 0.4 mm and smaller nozzles, so check the filament maker's minimum nozzle size. E3D also sells a 0.6 mm size.

E3D

E3D ObXidian Prusa Nextruder Nozzle (0.4 mm, single nozzle (PRUSA-MK4-NOZZLE-OBX-AS-0400))

Best for

Nextruder owners (MK4, MK4S, XL, CORE One, CORE One L) who print carbon-fiber, glass-fiber or glow filaments regularly.

Skip this if

You print only plain PLA and PETG, where a brass Nextruder nozzle does the job.

Verified fit

Prusa Research MK4S; Prusa Research CORE One; Prusa Research CORE One L; Prusa Research XL; Prusa Research MK4 (stock configuration, per the manufacturer)

Specs, strengths, and limitations

Interface

Prusa Nextruder nozzle with all-metal filament guide

Hotend design

Tool steel insert with E3DLC coating

Part rated to

300 °C (your printer's own hotend limit may be lower)

Wear-resistant

Yes, per the manufacturer

Maker notes

E3D product page: compatible with Prusa MK3.9, MK3.9S, MK4, MK4S, XL, CORE One & CORE One L. MK3.9/MK3.9S are not in printers.json. Amazon listing says MK4 and XL only; E3D's current page (manufacturer) also names MK4S, CORE One and CORE One L. Prusa Knowledge Base: every MK4S, MK3.9S, MK4, MK3.9, XL, CORE One/+, CORE One L/+ and Signature Oak printer has a Nextruder hotend. Each nozzle has its size engraved (E3D).

Strengths

• Manufacturer states wear resistance orders of magnitude higher than any other E3D nozzle, for abrasive/filled polymers.
• Manufacturer states the E3DLC coating adds non-stick properties for less plastic build-up.
• Manufacturer names the MK4, MK4S, XL, CORE One and CORE One L as compatible.

Limitations

• E3D lists a 300 °C maximum recommended printing temperature.
• E3D warns aggressive fillers (e.g. Polymaker Fiberon PA612-CF, PA6-CF, PA6-GF, PA12-CF) can still cause significant wear, and some filled materials can jam nozzles of 0.4 mm and smaller.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

Skip it if you print only plain PLA, PETG, TPU, ASA and ABS, where the stock brass nozzle does the job.

Polymaker PolyLite PLA-CF (Black, 1 kg)

PolyLite PLA-CF is PLA with 8% chopped carbon fiber by weight, for stiff, matte parts. Polymaker's product page says "0.4mm+ hardened nozzle required." Its TDS (V5.4) lists a 190–230 °C nozzle, a 25–60 °C bed and no closed chamber needed, so it suits an open XL once the nozzle is sorted. The TDS lists a heat deflection temperature of 50 °C at 1.8 MPa, lower than plain PLA.

Polymaker

Polymaker PolyLite PLA-CF (Black, 1.75 mm, 1 kg)

Best for

Stiff, matte-finish PLA parts and prototypes on a printer fitted with a hardened nozzle.

Skip this if

Your printer only has a brass nozzle, or the part will see heat.

Specs, strengths, and limitations

Material

PLA (carbon-fiber filled (8 wt% chopped carbon fiber))

Diameter

1.75 mm

Net filament

1000 g (filament only, not packaged weight)

Format

cardboard spool

Maker's nozzle range

190–230 °C

Nozzle

Abrasive: the maker recommends a wear-resistant nozzle

Strengths

• Manufacturer states 8% chopped carbon fiber gives exceptional rigidity and strength.
• Manufacturer states a matte black finish with virtually invisible layer lines and low shrinkage.
• Manufacturer states it prints with standard PLA settings; the TDS lists no enclosure needed.

Limitations

• Abrasive: Polymaker strongly recommends a hardened nozzle.
• Not suited to heat: the TDS lists a heat deflection temperature of 50 °C (1.8 MPa).
• Cardboard spool: Bambu Lab strongly advises a spool adapter or adapter ring for cardboard spools in the AMS.
• The Amazon listing's bullet points describe plain PolyLite PLA, though its title and model number (PA10001) are the carbon-fiber version. Check that the title says Carbon Fiber PLA before you buy.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

Skip it if the toolhead you'd use still has a brass nozzle, or the part will see heat.

Polymaker Fiberon PETG-rCF08 (Black, 0.5 kg)

Polymaker's product page describes Fiberon PETG-rCF08 as PETG with 8% recycled carbon fiber. Its TDS (V1.0) lists a 240–270 °C nozzle, a 60–70 °C build plate and a room-temperature chamber. It says brass nozzle wear "happens frequently," with a brass nozzle lasting "approximately 9h," and highly recommends a wear-resistant nozzle such as hardened steel or ruby. It recommends drying at 65 °C for 3 hours. The spool holds 0.5 kg, which can run out partway through a full-plate XL print, so check the slicer's filament estimate first. For more filled options, see the carbon fiber filament shortlist.

Polymaker

Polymaker Fiberon PETG-rCF08 (Black, 1.75 mm, 0.5 kg)

Best for

An easy first carbon-fiber PETG for matte functional parts and fixtures on a printer with a hardened nozzle.

Skip this if

You need parts that hold up above about 65 °C, or you want a 1 kg spool.

Specs, strengths, and limitations

Material

PETG (8% recycled carbon-fiber filled)

Diameter

1.75 mm

Net filament

500 g (filament only, not packaged weight)

Format

other

Maker's nozzle range

240–270 °C

Nozzle

Abrasive: the maker recommends a wear-resistant nozzle

Strengths

• Manufacturer states 8% recycled carbon fiber for added stiffness over standard PETG.
• Manufacturer states a matte finish that hides layer lines and PETG-level low warping.
• Prints at ordinary PETG temperatures (240–270 °C nozzle, 60–70 °C bed) per the TDS, with only a short 65 °C / 3 h dry.

Limitations

• Abrasive: Polymaker requires a hardened (or ruby) nozzle of 0.4 mm or larger; brass lasts about 9 h.
• Modest heat resistance: TDS heat deflection temperature is 65.7 °C at 1.8 MPa.
• Only sold in 0.5 kg and 3 kg spools, and Polymaker's enclosure guidance is inconsistent between page sections.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-07 against the manufacturer. Price and availability are on Amazon.

Skip it if the toolhead you'd use still has a brass nozzle, or you want a 1 kg spool.

What we left out

• Soluble supports (PVA+, BVOH, HIPS). Prusa documents them for the multi-tool XL, but none in our catalog has been checked yet.
• PC and nylon. Prusa lists both for the XL, but its XL+ FAQ points to the 60 °C external-heater enclosure version for polycarbonate and nylon. That heater is listed as upcoming and "not compatible with XL."
• Nylon carbon-fiber grades. Several in our catalog list nozzle ranges up to 300 °C, and E3D names Polymaker's Fiberon nylons among the fillers that can still wear ObXidian.

Checklist before you buy for an XL

• Material vs. enclosure. PLA, PETG and TPU work on the open XL. ASA and ABS need an enclosure, and large parts need it most.
• Which enclosure. The Original Prusa XL Enclosure is for the Original Prusa XL. Prusa says it stays compatible after an XL+ upgrade but won't reach 50 °C like the XL+ enclosure, which Prusa says is for the XL+ only.
• Temperatures. The hotend reaches 290 °C. Prusa lists the XL+ bed at up to 115 °C. Check the spool's published range.
• PETG on the bed. The standard satin sheet suits it. On smooth PEI, use glue stick.
• Abrasive fills. Carbon fiber, Kevlar, wood and metal fills need a wear-resistant nozzle, not the stock brass, on every toolhead that prints them.
• Soluble supports. Match the support to the main material: BVOH for PETG, PVA+ or BVOH for PLA.
• Spool weight. Prusament ASA is 800 g, PolyFlex TPU95 is 0.75 kg and Fiberon PETG-rCF08 is 0.5 kg. Everything else here is 1 kg. Large prints use a lot of filament.

Drying, storage and safety

PETG, TPU, ASA and ABS are the most moisture-sensitive materials here, and Prusa says soluble supports are very hygroscopic. Each maker's drying setting is on its product card above. Use the setting for your exact spool, and check the spool's own temperature rating before drying it on the spool. Our filament dryer vs dry box guide covers the options.

How this page was checked

This is a research-based page. We have not printed these spools on an XL for it, so it contains no test results or scores. The printer limits come from Prusa's XL+ product page, including its specifications, FAQ and Original Prusa XL comparison table, the Original Prusa XL Enclosure page, Prusa's XL-to-XL+ upgrade page, and Prusa Knowledge Base articles on nozzles, soluble supports and each material. The spool and nozzle statements come from each maker's own pages and data sheets, listed in the sources section. All were retrieved on 2026-10-09. Makers update their pages, so check the current version before relying on a number. Read more in our editorial standards and affiliate disclosure.

PLA: what to check before you buy a spool ↗