3D Printing Filament FAQ

Filament is the thermoplastic feedstock used in FDM/FFF 3D printers. It comes on spools, typically 1 kg, and is melted through a heated nozzle to build objects layer by layer.

PLA (Polylactic Acid) is the best starting point. It prints at low temperatures (190-220 °C), doesn’t require a heated bed, rarely warps, and is available in hundreds of colors. Once comfortable, PETG is the natural next step.

These are the two standard filament diameters. 1.75 mm is by far the most common and supported by nearly all modern printers. 2.85 mm (sometimes labeled 3.0 mm) is used by certain professional machines like Ultimaker. Check your printer’s specs — the two are not interchangeable.

Standard PLA costs roughly €15–30 per kg. PETG and ABS are similar. Engineering filaments (PA, PC) run €40–80/kg, while high-performance materials (PEEK, PEI) can exceed €200/kg. A typical small print uses 20–50 g of filament.

Your slicer software estimates filament use before printing. As a rule of thumb: a 5 cm cube with 20% infill uses about 15–20 g. Most hobbyist prints weigh 20–100 g, so a 1 kg spool yields many prints.

0.4 mm is the standard and works for most prints. Use 0.2 mm for very fine detail (miniatures) or 0.6–0.8 mm for faster, stronger functional parts. Larger nozzles also reduce clogging risk with filled filaments.

PLA is a plant-based, biodegradable thermoplastic. It’s the easiest filament to print and ideal for prototypes, decorative items, cosplay props, and educational projects. Its main weakness is low heat resistance (~55 °C).

PETG combines the ease of PLA with better strength, flexibility, and chemical resistance. It’s great for functional parts, outdoor use, and food-adjacent applications. Print at 230–250 °C with a 70–80 °C bed.

ABS is a strong, heat-resistant plastic (HDT ~100 °C) used in automotive and electronic housings. It warps significantly when cool air hits the print, so an enclosed printer is strongly recommended. It also emits fumes during printing.

ASA is ABS’s UV-resistant cousin. It has similar mechanical properties but far better weatherability, making it the go-to for outdoor functional parts. It still needs an enclosure and has similar fume concerns.

TPU (Thermoplastic Polyurethane) is a flexible, rubber-like filament. Shore hardness ranges from 85A (very flexible) to 98A (semi-rigid). Use it for phone cases, gaskets, wheels, and vibration dampeners. Print slowly (20–30 mm/s) with a direct-drive extruder.

Nylon is an engineering-grade filament with excellent strength, toughness, and wear resistance. It’s highly hygroscopic — it must be dried before printing. Variants include PA6, PA12, and PA6/66 copolymers. Print at 250–280 °C.

PC is one of the strongest printable thermoplastics with excellent impact resistance and heat tolerance (~140 °C). It requires high nozzle temps (270–310 °C), an enclosure, and careful moisture management.

PEEK (Polyether Ether Ketone) is a high-performance polymer with exceptional heat resistance (HDT >250 °C), chemical resistance, and strength. It requires specialized printers with 400 °C+ hotends and heated chambers. Used in aerospace and medical implants.

PEI is a high-performance amorphous thermoplastic with a heat resistance of ~215 °C, flame retardancy (UL94 V-0), and good chemical resistance. Like PEEK, it requires high-temperature printing equipment.

PVA (water-soluble) and HIPS (limonene-soluble) are used as dissolvable support structures in dual-extrusion printers. PVA pairs with PLA; HIPS pairs with ABS. They allow printing complex geometries with overhangs that would be impossible otherwise.

HT-PLA is modified PLA that can be annealed (heat-treated) after printing to crystallize and increase its heat resistance from ~55 °C to 80–120 °C. Brands include Protopasta HTPLA, ColorFabb HT, and FormFutura Volcano PLA.

Carbon fiber filament is a base polymer (PLA, PETG, PA, PC) with chopped carbon fiber strands mixed in. It adds stiffness and dimensional stability while reducing weight. Requires a hardened steel nozzle since carbon fiber is abrasive.

Similar to carbon fiber composites but uses glass fibers instead. Glass fiber adds stiffness and heat resistance at lower cost than carbon fiber. Also requires a hardened nozzle.

Wood filament blends PLA with fine wood particles (cork, bamboo, or wood dust). Prints have a natural wood appearance and can be sanded and stained. Use a 0.5 mm+ nozzle to avoid clogging.

Metal filaments mix PLA or PETG with metal powders (copper, bronze, stainless steel). Prints are heavy and can be polished to look like real metal. They’re abrasive — use a hardened nozzle.

Yes, glow-in-the-dark filaments contain strontium aluminate phosphor particles in a PLA or PETG base. They charge under light and glow for several hours. The particles are highly abrasive — a hardened nozzle is essential.

Typically 190–220 °C nozzle and 0–60 °C bed. Start at 210 °C and adjust in 5 °C increments. Lower temps give sharper detail; higher temps improve layer adhesion.

230–250 °C nozzle and 70–85 °C bed. PETG likes it hot — too low and you get poor layer adhesion. Reduce cooling fan to 30–50% compared to PLA.

230–260 °C nozzle and 95–110 °C bed, inside an enclosure with ambient temp of 40–60 °C. ABS is very sensitive to drafts and temperature fluctuations.

10–20% for decorative objects, 20–40% for general use, 40–60% for functional/structural parts, 80–100% for maximum strength. Infill pattern matters too — cubic and gyroid offer the best strength-to-weight ratio.

40–60 mm/s is a safe default for most materials. PLA handles up to 100+ mm/s on modern printers. TPU should be printed at 20–30 mm/s. Reduce speed for overhangs and fine details.

0.2 mm is the standard balance of speed and quality. Use 0.12–0.16 mm for detailed models and 0.24–0.32 mm for quick, functional prints. Layer height should not exceed 75% of your nozzle diameter.

In airtight containers or vacuum-sealed bags with silica gel desiccant. Ideal conditions are 20–25 °C and below 20% relative humidity. Avoid direct sunlight. Resealable Mylar bags or dry boxes with hygrometers work well.

Filament doesn’t expire in the traditional sense, but it degrades with moisture absorption. PLA and PETG stored properly last 1–2 years. Nylon and PVA are extremely hygroscopic and may degrade within weeks if exposed to humid air.

Use a filament dryer, food dehydrator, or oven at low temperature. PLA: 45–50 °C for 4–6 hours. PETG: 65 °C for 4–6 hours. Nylon: 70–80 °C for 8–12 hours. Dedicated filament dryers are safest and most consistent.

Signs include: popping/crackling sounds during printing, excessive stringing, rough/bubbly surface finish, reduced part strength, and visible steam from the nozzle. A snap test can also help — dry PLA snaps cleanly; wet PLA bends.

Replace when you notice declining print quality, inconsistent extrusion, or after printing significant quantities of abrasive filaments (carbon fiber, glow-in-the-dark, metal-filled). Brass nozzles typically last 3–6 months with standard materials.

Warping happens when layers cool unevenly and contract. Solutions: increase bed temperature, use an enclosure (especially for ABS/ASA), apply adhesive (glue stick, hairspray), add a brim in your slicer, and eliminate drafts near the printer.

Enable retraction in your slicer (0.5–2 mm for direct drive, 4–7 mm for Bowden). Lower nozzle temperature by 5–10 °C. Increase travel speed. Ensure filament is dry — moisture is a major cause of stringing.

Check bed leveling first — the nozzle should be close enough to slightly squish the filament. Clean the bed with isopropyl alcohol. Increase first layer temperature and reduce first layer speed (15–20 mm/s). A textured PEI sheet offers excellent adhesion for most materials.

Common causes: heat creep (poor cooling of the cold end), moisture in filament, switching materials without purging, or printing too close to the bed. Try a cold pull (atomic method): heat to printing temp, insert filament, cool to 90 °C, then pull firmly.

Insufficient nozzle temperature, too much cooling fan, drafts, or wet filament. Increase temperature by 5–10 °C, reduce fan speed, and ensure filament is dry. For ABS/ASA, an enclosure is essential.

These are caused by pressure changes at layer starts. Set your slicer’s seam position to ‘aligned’ or ‘rear’ to hide them. Adjust retraction and coasting settings. Linear/pressure advance in firmware can also help.

Tensile strength (in MPa) is the maximum stress a material can withstand while being stretched before breaking. Higher values mean the part can resist more pulling force. PLA: ~50 MPa, PETG: ~45 MPa, ABS: ~40 MPa, Nylon: ~70 MPa.

HDT is the temperature at which a material deforms under a standardized load. It indicates the upper service temperature. PLA: ~55 °C, PETG: ~75 °C, ABS: ~100 °C, PC: ~140 °C, PEEK: >250 °C.

Density (g/cm³) is mass per unit volume. Higher density means heavier prints. PLA: 1.24, ABS: 1.04, PETG: 1.27, PA: 1.01–1.14, TPU: 1.20–1.25. Density also affects how many meters of filament are on a spool.

It depends on what ‘strongest’ means. For tensile strength: Nylon and Polycarbonate. For impact resistance: PC and PETG. For stiffness: carbon fiber composites. For overall toughness: Nylon blends. Layer adhesion is also critical — even strong materials fail at weak layer bonds.

In order: PEEK (>250 °C) > PEI (215 °C) > PPS (200 °C) > PC (140 °C) > ABS/ASA (100 °C) > PETG (75 °C) > PLA (55 °C). HT-PLA can reach 80–120 °C after annealing.

Some base polymers are food-safe (PETG, PP), but the printing process introduces risks: layer lines harbor bacteria, brass nozzles may contain lead, and colorants may not be food-grade. For food contact, use certified food-safe filament, a stainless steel nozzle, and apply a food-safe epoxy coating.

PLA emits minimal fumes. ABS, ASA, and Nylon release potentially harmful VOCs and nanoparticles. Always ventilate your printing space. Use an enclosure with a carbon filter for ABS/ASA. PETG and PLA are generally considered safe in well-ventilated rooms.

PLA is industrially compostable (breaks down in 6–12 months at 58+ °C in commercial composting facilities), but it does not biodegrade in home compost, landfills, or natural environments within a practical timeframe.

Yes, but not through regular household recycling. Some companies accept used filament and failed prints. Desktop filament recyclers (like Felfil or Filabot) can re-extrude PETG, ABS, and other materials. PLA recycling infrastructure is still limited.

Recommended for all materials, essential for ABS, ASA, Nylon, and PC. A well-ventilated room or an enclosure with HEPA + activated carbon filtration is ideal. PLA and PETG are lower risk but still emit ultrafine particles.

Yes. Premium brands offer tighter diameter tolerances (±0.02 mm vs ±0.05 mm), more consistent color, lower moisture content, and better roundness. This results in fewer clogs, more reliable prints, and more predictable mechanical properties.

Key properties: tensile strength, elongation at break, HDT, Vicat softening point, density, and recommended print temperatures. Also check: diameter tolerance, moisture level, and whether testing followed ISO/ASTM standards (injection molded vs. 3D printed specimens).

A TDS is a document from the filament manufacturer listing the material’s mechanical, thermal, and physical properties, along with recommended print settings. Filabase collects and normalizes TDS data to make comparison easy.

Focus on properties tested under the same standards (ISO 527 for tensile, ISO 75 for HDT). Be aware that some brands report injection-molded values which are higher than 3D-printed results. Filabase normalizes this data for fair comparison.