3D Printer Filament Types Explained UK

Choosing the right filament matters as much as choosing the right printer. The material determines strength, heat resistance, and flexibility. PLA is the default for beginners, but PETG, ABS, TPU, and specialty composites each solve problems PLA can't. This guide covers every filament type for UK makers.

Why Filament Choice Matters

Every FDM printer melts plastic filament through a heated nozzle and layers it to build objects. The plastic you feed it changes everything about the result. PLA prints easily but warps in a hot car. PETG absorbs moisture if left out overnight. ABS releases fumes that need ventilation. Picking the wrong filament for a project means wasted time, failed prints, or parts that break when you actually use them.

PLA - The Beginner's Best Friend

PLA (polylactic acid) is made from corn starch or sugarcane, making it biodegradable under industrial composting conditions. It prints at 190-220°C, doesn't need a heated bed (though 50-60°C helps), and produces almost no smell. This is why every printer ships with a PLA sample spool - it's the material most likely to give you a successful first print.

PLA works well for prototypes, decorative items, cosplay props, and anything that won't sit in direct sunlight or near heat sources. The surface finish is smooth, colours are vibrant, and it's easy to sand and paint. ELEGOO PLA+ is a reliable starting point - the "plus" formula adds impact resistance over standard PLA without changing print settings much.

PETG - The Practical Middle Ground

PETG (polyethylene terephthalate glycol) is the filament most experienced makers switch to after outgrowing PLA. It prints at 220-250°C with a bed temperature of 70-80°C, produces minimal fumes, and delivers parts that are significantly tougher than PLA. PETG handles impacts without cracking, tolerates temperatures up to about 80°C, and resists most household chemicals.

TECBEARS PETG is a solid budget option that prints consistently on most machines. PETG is the material for functional parts - brackets, containers, jigs, outdoor fixtures, and anything that needs to survive being dropped or left in the sun. It's also food-safe in its raw form, though layer lines harbour bacteria, so don't use it for food contact without sealing.

ABS - Tough Parts, Extra Effort

ABS (acrylonitrile butadiene styrene) produces strong, heat-resistant parts that can be smoothed with acetone vapour. It tolerates temperatures above 100°C and resists oils and solvents. eSUN ABS+ HS is a fast-printing variant, while eSUN ABS+ offers lower warping for beginners.

The catch: ABS needs an enclosed printer. It warps aggressively on open beds due to thermal contraction, and it releases volatile organic compounds while printing. You need good ventilation or an enclosure with filtration. Print at 230-260°C with a bed at 100-110°C. If your printer doesn't have an enclosure, you can build one from acrylic sheet and magnets for under £20.

TPU - Flexible and Impact-Proof

TPU (thermoplastic polyurethane) prints like firm rubber. Shore hardness ranges from 85A (squishy) to 95A (rigid-flex), and the resulting parts absorb impacts, create airtight seals, and bend without breaking. Phone cases, watch straps, gaskets, vibration dampeners, and prosthetic liners all use TPU.

The material is unforgiving with printer setup. It requires a direct-drive extruder (Bowden setups cause jams), slow print speeds (20-30mm/s), and high retraction distance tuning. Most TPU prints fail not because of the material but because the extruder can't push the soft filament through the tube consistently. If you have a direct-drive printer, TPU is surprisingly approachable. If you don't, it's a headache.

TPU absorbs moisture faster than almost any other filament. Store it in a dry box and dry it before printing if it's been open for more than a day. Wet TPU produces bubbly, weak prints with terrible surface finish.

ASA - Outdoor and UV-Resistant

ASA (acrylonitrile styrene acrylate) is essentially ABS with UV resistance added. It prints with similar settings to ABS (230-260°C, bed at 100-110°C, enclosure recommended) but doesn't yellow or degrade in sunlight. For anything that lives outdoors - garden planters, mailbox mounts, bird feeders, outdoor sensor housings - ASA is the right choice.

ASA does produce fumes similar to ABS, so ventilation is still necessary. The surface finish is slightly matte compared to ABS, and it doesn't acetone-smooth as cleanly. For outdoor UK projects where rain, frost, and sun are constant factors, ASA outlasts every other common filament type.

Specialty Filaments - When You Need More

Beyond the main five, several specialty filaments serve specific niches:

Wood-fill blends PLA with actual wood particles (typically 20-30% wood content). The result has a woodgrain texture, can be sanded and stained, and smells faintly of sawdust during printing. It clogs nozzles more easily than plain PLA, so use a 0.6mm nozzle and print slowly. Good for decorative items, jewellery, and cosplay props that need a natural look.

Carbon-fiber reinforced filaments (PA-CF, PETG-CF) embed chopped carbon fibers in a base polymer. The result is stiffer and lighter than unfilled plastic - roughly 60% the weight of aluminium with comparable rigidity for thin sections. These require hardened steel nozzles because the carbon fibers eat through brass. Industrial and engineering applications mainly, but increasingly used for functional jigs and fixtures in home workshops.

Where to Buy Filament in the UK

Amazon UK stocks eSUN PLA+ and ELEGOO PLA+ with Prime delivery. For specialty materials like carbon-fiber reinforced or high-temp nylons, RS Components, Additive X, and 3D Printer Works carry professional-grade options.

Filament Storage and Moisture

Most filaments absorb moisture from the air, and wet filament prints terribly - stringing, popping sounds during extrusion, weak layer adhesion, and rough surfaces. PLA and Nylon are the worst offenders. PETG and ABS absorb moisture too, but less aggressively.

The fix is simple: store open filament in a sealed container with silica gel desiccant, or use a filament dryer box. A basic dry box costs £15-30 and keeps filament at low humidity for months. If your filament has been sitting in an open room for more than a week, dry it at 40-50°C for 2-4 hours before printing. A filament dryer is a useful accessories you can buy.

Quick Comparison Table

Frequently Asked Questions

What is the best filament for beginners?

PLA prints at low temperatures (190-220°C), doesn't need a heated bed, and rarely warps. Almost every FDM printer ships with a sample spool. Once you're comfortable, move to PETG for functional parts.

Can I use PLA for outdoor projects?

PLA degrades in sunlight and softens above 55°C, making it unsuitable for permanent outdoor use. For outdoor items, use ASA or PETG instead - both handle UV exposure and temperature swings far better. ASA is the best choice for parts that live outside year-round in UK weather.

What filament is strongest for functional parts?

Carbon-fiber reinforced filaments (like PA-CF or PETG-CF) offer the best stiffness-to-weight ratio. For pure impact resistance, TPU absorbs shocks without cracking. ABS is best for parts that need heat resistance above 80°C. For most functional UK maker projects, PETG strikes the right balance between strength and ease of printing.

Do I need a special nozzle for carbon-fiber filament?

Yes. Carbon-fiber reinforced filaments are abrasive and will wear through a standard brass nozzle within a few hours. Use a hardened steel or ruby-tipped nozzle rated for abrasive materials. A replacement nozzle costs £5-15 and saves you from clogged prints mid-project.

Where can I buy 3D printer filament in the UK?

Amazon UK stocks most major brands (eSUN, ELEGOO, Prusament) with next-day Prime delivery. Specialist retailers like RS Components, Additive X, and 3D Printer Works carry premium and industrial filaments that Amazon often doesn't stock. For budget PLA and PETG, Amazon is hard to beat on price and speed.

How should I store 3D printer filament?

Store filament in a sealed container or dry box with silica gel desiccant. PLA absorbs moisture over time, causing stringing and poor layer adhesion. A filament dryer box costs under £30 and extends shelf life significantly. If filament has been open for more than a week, dry it before printing.

Final Verdict

Start with PLA. Print your first ten projects, learn your printer's quirks, and get comfortable with slicing settings. Then add a spool of PETG for anything that needs to survive heat or impact. Those two materials cover 90% of what UK makers need. ABS, TPU, ASA, and specialty filaments fill the remaining 10% - and you'll know when you need them because PLA and PETG won't cut it for that specific job.

For more maker guides, visit MakerUK.

This article is for informational purposes only. Always follow manufacturer safety guidelines when working with 3D printers and filaments. Ensure adequate ventilation when printing ABS, ASA, or other fume-producing materials.

Last reviewed: 2026-08-28