Best PLA filament in the UK: how to choose

The best PLA filament for most people in the UK is a plain 1.75 mm PLA or PLA+ from an established brand, bought at the lowest price per kilogram rather than the lowest price per spool. Among the well-known brands the differences in print quality are small, and far smaller than the differences in price. What separates a good buy from a bad one is mostly on the listing: the real weight, the spool it comes on, and whether it is the version of PLA your printer can use.

This guide does not name one winner, because the cheapest good spool changes week to week. It explains how to judge any listing, and the live ranking is at PLA ranked by £/kg.

1. Compare price per kilogram, not per spool

Filament is sold in 250 g, 500 g, 1 kg, 2 kg, 3 kg and 5 kg reels, and in bundles of anything from two to ten. A low headline price is very often a small spool. Three checks:

• Net weight of filament. The figure that matters is the plastic, not the plastic plus the reel. Most 1 kg spools are 1 kg net, but check, and check again after pressing a colour button, because variants on one listing can differ in weight as well as price.
• Total weight of a bundle. “4 spools” might be 4 kg or 4 × 250 g.
• Price divided by kilograms. That single number lets a 3 kg reel, a four-pack and a single spool be compared honestly. It is what every list on this site is sorted by.

Multi-kilo packs are usually the cheapest way to buy, provided you will use one colour in that quantity: see bulk filament ranked by £/kg and filament bundles: are they worth it? If you only want one reel, single spools leaves the bundles out.

2. Diameter and tolerance

Nearly every current desktop printer uses 1.75 mm filament. The other size, 2.85 mm, fits a small number of machines, and the two are not interchangeable.

Tolerance is how much the diameter is allowed to wander along the length of the spool. Most brands state ±0.02 or ±0.03 mm, and either is fine. A consistent diameter matters because the printer assumes it: a thick section over-extrudes and a thin one leaves gaps. The stated figure is the manufacturer's own claim rather than something independently checked, so treat a missing figure as a warning and a stated one as a minimum expectation, not a guarantee.

3. The spool: cardboard, plastic and multi-colour units

The reel matters more than it used to, because many printers now feed from an enclosed multi-spool unit such as the Bambu Lab AMS or the equivalents from other makers.

• Plastic spools roll smoothly and work in almost everything. They are harder to recycle.
• Cardboard spools recycle with paper and card. In a unit that turns the spool on rollers they can slip, wear at the edges and shed dust. Many people use them without trouble, and a printed rim adapter fixes the ones that slip, but it is worth knowing before you buy ten.
• Size. Multi-spool units accept a limited range of spool widths and diameters. A standard 1 kg reel normally fits. A 3 kg reel or an unusually wide one will not, and has to feed from an external holder. Check your unit's stated limits.

If your spools sit on an open holder beside or above the printer, either type is fine. See spool holders and why they matter.

4. Refill coils

A refill is filament wound as a coil with no reel, made to fit onto a reusable spool that you keep. It uses less packaging and is usually a little cheaper per kilogram. It is useless without the matching reusable spool, and different brands' refills and spools do not always fit one another, so check the dimensions. If you already own a reusable spool, start at refill filament ranked by £/kg.

5. PLA, PLA+ or high-speed PLA?

None of these names is a standard, so one brand's PLA+ is not the same as another's. All three soften at roughly the same temperature, around 55 to 60 °C. See PLA+ ranked by £/kg and high-speed PLA: what it is and who needs it. Silk, matte, marble and other finishes are PLA with additives; they look different and print slightly differently, and are best bought for a project rather than as your everyday spool.

6. Budget brands and premium brands

On Amazon UK, the budget end is dominated by high-volume brands such as SUNLU, eSUN, ELEGOO, Creality, Anycubic, JAYO, ERYONE and GEEETECH. These are what most hobbyists print with most of the time. They are generally consistent, they are frequently discounted, and they sell in multi-packs that bring the price per kilogram down further.

Premium brands such as Prusament, Polymaker and colorFabb, along with Bambu Lab's own filament, cost noticeably more per kilogram. Not all of them are sold on Amazon. What the extra buys is mainly consistency and information: tighter and sometimes documented tolerances, colours that match from one batch to the next, neater winding, and tuned profiles for the maker's own printers.

Whether that is worth it depends on the job:

• Everyday prints, prototypes, brackets, toys: a budget brand. You will not see the difference.
• A large project in one colour, where a second batch must match the first: buy it all at once, or pay for a brand known for colour consistency.
• Long unattended prints and print farms: reliability is worth more than a pound or two per kilogram. One tangle costs more than the saving.

Be more careful with brands you have never heard of at prices far below everyone else's. Look at how many reviews the listing has and how recent they are, and read the critical ones for the two complaints that matter: tangled winding and brittle, damp filament.

7. Signs of a well-made spool

• Vacuum-sealed with desiccant. PLA absorbs moisture slowly, but a spool that arrives in a loose or punctured bag may already be damp. See do you need a filament dryer?
• Neat, even winding with the loose end tucked through a hole in the rim. Crossed-over winding causes tangles mid-print.
• A printed temperature range on the label. Use it in preference to a generic profile.
• A stated tolerance and net weight.

Cheap PLA in the UK: where the savings really are

1. Buy by price per kilogram, which often means a multi-pack or a 2 to 3 kg reel.
2. Be flexible on colour. Black, white and grey from the same brand are often priced differently, and the cheapest colour changes.
3. Use refills once you own a reusable spool.
4. Check the price history before trusting a “deal” badge. The current drops are on the deals page.

New to this and placing a first order? Read your first filament order: what to buy, then pick from PLA ranked by £/kg.

Questions people ask

What is the best PLA filament to buy in the UK?

The best PLA filament for most UK buyers is a plain 1.75 mm PLA or PLA+ from an established brand, chosen by the lowest price per kilogram rather than the lowest price per spool. Print quality differs little between the well-known brands, while prices differ a lot and change weekly. Check the net weight, the spool type and the stated tolerance before buying.

Is expensive PLA filament better than cheap PLA?

Expensive PLA filament is more consistent rather than dramatically better. Premium brands typically offer tighter tolerances, colours that match between batches, neater winding and tuned printer profiles. For everyday prints, prototypes and toys, a budget PLA from an established brand prints just as well, and the premium is mainly worth paying for long unattended prints or projects where colour must match.

Does filament diameter tolerance matter when buying PLA?

Yes, PLA diameter tolerance matters because the printer assumes a constant diameter, so thick sections over-extrude and thin sections leave gaps. Most brands state plus or minus 0.02 or 0.03 mm on 1.75 mm filament, and either is fine. The figure is the manufacturer's own claim, so treat a listing with no stated tolerance as a warning sign.

Do cardboard filament spools work in a Bambu Lab AMS?

Cardboard filament spools often work in a Bambu Lab AMS and similar multi-spool units, but not always smoothly. Because the unit turns the spool on rollers, cardboard rims can slip, wear and shed dust. A printed rim adapter usually fixes a spool that slips, and plastic spools avoid the issue entirely.

Should I buy PLA or PLA+ filament?

Buy standard PLA for models, decorations and light-duty parts, and PLA+ for functional parts that are handled, clipped together or likely to be dropped. PLA+ is PLA modified to be less brittle with better layer bonding, and it prints just as easily. The name is not a standard, so the recipe varies by brand, and both soften at around 55 to 60 degrees Celsius.

Why should I compare PLA filament by price per kilogram?

Price per kilogram is the only fair way to compare PLA filament, because spools range from 250 grams to 5 kilograms and bundles contain anything from two to ten reels. A low headline price is very often a small spool. Dividing the price by the net weight of filament lets a single spool, a multi-pack and a large reel be compared directly.

Which brands make budget PLA filament in the UK?

Budget PLA filament on Amazon UK is dominated by high-volume brands such as SUNLU, eSUN, ELEGOO, Creality, Anycubic, JAYO, ERYONE and GEEETECH. These brands are generally consistent, are frequently discounted and sell multi-packs that lower the price per kilogram. Premium alternatives include Prusament, Polymaker and colorFabb, which cost more and are not always sold on Amazon.