You have a working PLA profile, the prints come off the plate cleanly, and now a reel labelled PLA+ promises greater strength. Should you change materials for the next bracket or buy the ordinary PLA you already know?
On this page
- What does PLA+ mean?
- The practical differences
- "Stronger" can mean four quite different things
- Three real products illustrate why names are not enough
- Will PLA+ make a bracket or clip last longer?
- Heat resistance: the upgrade many buyers assume
- Printing PLA+ successfully
- How to compare two reels fairly
- Is the price premium worth paying?
The honest answer is that PLA+ is a product name, not a single guaranteed set of material properties. One manufacturer's plus formulation may concentrate on surviving knocks. Another may prioritise flow at higher print speeds. A third may offer a different balance of stiffness and surface finish. You have to compare the exact reels, not the plus sign on their boxes.
For display models and uncomplicated prototypes, good standard PLA often does everything required. For a clip, handle, fixture or enclosure likely to be dropped, a documented toughened PLA may be worth the extra cost. Neither is an automatic substitute for a genuinely heat-resistant material.
What does PLA+ mean?
PLA is polylactic acid, the family of plastics familiar to most desktop filament printers. Typical commercial filament includes colourants and other ingredients selected by its maker. "PLA+", "PLA Plus", "PLA Pro" and "tough PLA" generally signal a modified formulation, but they do not identify one universal recipe, test standard or minimum strength threshold.
For example, eSUN publishes a technical data sheet for its PLA+, SUNLU markets a distinct PLA+ 2.0 range, and Polymaker has a PLA Pro formulation. They are not interchangeable simply because all three appear in a search for stronger PLA.[1][2][3]
This matters when a review says one unspecified PLA+ is "twice as strong". Twice as strong in *what*? A printed part can resist one bending load yet crack under a sudden impact, or survive a knock but deform when held under a constant load. The term strong needs a test and a direction.
The practical differences
| Question | Ordinary PLA | A documented PLA+ or PLA Pro product |
|---|---|---|
| Easy first prints? | Often an excellent starting point | Frequently similarly approachable; check its own profile |
| Stiffness and shape retention | Typically quite stiff at room temperature | May be similar, lower or higher depending on the blend |
| Sudden knocks and brittle failure | Can snap when overloaded | Some toughened versions are specifically designed to improve impact behaviour |
| Fine detail and surface finish | Often very good | Depends on the actual formulation, pigment and settings |
| Print temperature | Use the reel's specified range | May need a hotter nozzle or a different speed/flow calibration |
| Heat in a car or sunny window | A weakness | Usually still a weakness unless independent thermal data proves otherwise |
| Cost | Often the lower-cost option | Judge the premium against failed prints and the actual job |
Think of this as a shopping checklist, not a table of universal measured values. The specific product sheet is the authority for its rated properties. Prusa's material guidance describes ordinary PLA as easy to print but relatively brittle and limited by heat and UV exposure.[4]
"Stronger" can mean four quite different things
Tensile strength concerns resistance to being pulled apart. A figure in megapascals (MPa) is not a general promise that a hook will hold that many kilograms.
Flexural strength and stiffness concern bending. A rigid plastic may bend only slightly under load but still fail suddenly. An apparently more forgiving material may deflect further without breaking.
Impact resistance asks what happens when something is struck or dropped. This is often the property a toughened PLA aims to improve. Charpy and Izod figures, however, use different specimen arrangements and must not be compared as though the numbers were equivalent.
Layer-direction strength asks how the deposited lines and layers hold together. In a printed hook, the load may try to peel layers apart even though a flat test bar from the same filament looks impressive. Print orientation, wall count, temperature, cooling and geometry all contribute.
There is a particularly useful illustration in eSUN's July 2025 PLA+ technical sheet. Under its specified test conditions, it reports tensile strength of 53.34 MPa in the X–Y orientation and 31.2 MPa in Z.[1] Those numbers are for its own test specimens, not a prediction for every home-printed bracket. The gap is a reminder to consider the layer direction before arguing about which spool wins.
The PLA strength-testing guide explains how a repeatable bending, pulling or impact comparison could be designed, without passing off manufacturer figures as results from our own bench.
Three real products illustrate why names are not enough
eSUN PLA+
eSUN's published sheet lists a 210–230°C nozzle range, a 45–60°C bed range and a reported heat-distortion temperature of 53°C at 0.45 MPa.[1] Its mechanical data includes separate X–Y and Z values, together with test methods and print conditions. That is much more useful than a large "stronger" badge alone.
The manufacturer recommends drying preparation in the sheet; follow the instructions for the precise reel rather than treating every PLA or PLA+ as requiring the same treatment. Our drying and storage guide distinguishes genuinely needed preparation from unnecessary routine drying.
SUNLU PLA+ 2.0
SUNLU positions PLA+ 2.0 around toughness and faster printing. Its UK product page gives 205–215°C for 50–100 mm/s and 215–245°C for 100–200 mm/s, with a 50–60°C bed.[2] That speed-dependent temperature advice is a useful warning: a profile that works at a gentle pace may be too cool when the printer pushes considerably more plastic each second.
SUNLU also advertises an impact figure for this range. Treat that as the manufacturer's claim, and compare specimen type and test method before setting it alongside another company's impact number. It is not our independent finding.
Polymaker PLA Pro
Polymaker says its newer Polymaker PLA Pro supersedes PolyLite PLA Pro, a different, older formulation. Its own guide gives a 210–230°C nozzle range, a 30–60°C build-plate range, and describes improved toughness while remaining compatible with ordinary open-frame printing.[3]
Product names and formulations change. A review or downloadable sheet for *PolyLite* PLA Pro may not describe a newly bought reel of *Polymaker* PLA Pro. Check which version the retailer is selling, and use the matching current technical sheet and profile.
These examples are provided to show differences in specification and positioning. They are not a ranking or a claim that we have printed and physically tested all three.
Will PLA+ make a bracket or clip last longer?
It may, particularly if the current failure is an abrupt crack from a modest impact or a repeatedly handled part. But start by finding where the part failed.
If a clip's thin arm snaps at a sharp inside corner, a larger radius, less severe deflection or more suitable orientation can have a greater effect than switching brands. If a bracket splits neatly along its layer lines, increasing the toughness of the bulk material may not overcome a poorly oriented print or inadequate bonding.
For an item that is bent repeatedly, you need to think about flexibility, fatigue and long-term deformation as well as the first successful bend. PLA+ does not automatically become a substitute for flexible TPU, PETG or a purpose-designed engineering material. An improved impact result is not proof of good hinge life.
We would keep a known standard PLA for a decorative nameplate, a non-loaded alignment aid or a prototype that will be revised tomorrow. We would consider a toughened PLA with clear technical evidence for a lightly loaded snap-fit, workshop fixture or portable enclosure, then test the actual part under the load it will see.
Heat resistance: the upgrade many buyers assume
This is the biggest trap. A stronger PLA formulation may remain vulnerable in a hot car, a sunlit enclosure or near a motor. The eSUN PLA+ sheet's 53°C heat-distortion figure is a good example: it certainly does not grant unrestricted use at 80°C.[1]
Heat-distortion tests involve specified loads, so the number is not a perfect real-world failure temperature. Colour, wall thickness, sustained stress and direct sunlight also affect the outcome. Nevertheless, if a part needs to maintain dimensions in a warm environment, check documented thermal performance instead of assuming a plus sign solves it.
PETG, ASA, ABS or another material may be the more sensible starting point, each with its own printing and safety trade-offs. For an outdoor or hot-environment product, material selection should be based on exposure and mechanical load, not marketing categories.
Printing PLA+ successfully
Start with the exact maker's guidance, choose a suitable material profile and run a small functional test. Do not simply increase the nozzle temperature by a fixed amount because the spool has a plus sign.
- Confirm the reel: product name, generation, diameter and any high-speed designation. Check the maker's current profile rather than a community profile for a similarly named filament.
- Choose an initial temperature within the published range. If running faster, check the higher-speed recommendation and the printer's real melt capacity.
- Keep the first comparison controlled: same model, orientation, layer height, wall count, infill and cooling where both materials permit it. Document any necessary settings differences.
- Inspect the complete part, not just the attractive outer wall. Fit, bridging, overhangs, seam and layer adhesion all matter.
- Test the application with an appropriately safe load. A print that feels less brittle in the hand is not a certified load-bearing component.
Nozzle temperature, cooling and layer adhesion interact. A hotter setting can improve bonding but also change strings, overhangs and surface detail. Print a small calibration specimen before committing to a long job. See the settings and nozzle guide for the relationship between temperature, flow and speed.
If using an automatic material feeder, also confirm the physical spool dimensions and winding behaviour. Material compatibility and feeder fit are separate questions; see the AMS fit guide.
How to compare two reels fairly
Marketing comparisons often mix different specimens and printing conditions. A useful buyer's record would contain:
| Record | Why it matters |
|---|---|
| Full brand, grade and version | Prevents mixing up old and new formulations |
| Actual nozzle/bed settings and speed | Changes melting and inter-layer bonding |
| Orientation, walls, infill and specimen dimensions | Determines the load path through the print |
| Test method and failure direction | Makes "strength" a specific, interpretable observation |
| Repeat count and failed pieces | Avoids ranking a material from one lucky part |
| Fit, finish and failure rate | Determines whether stronger feedstock is practically useful |
| Cost per *usable* part | Includes rejected prints and settings development |
If comparing published technical sheets, align the same test method, specimen direction and conditions first. If those are missing, state the limitation and avoid a numerical winner. We do not currently have a controlled, brand-against-brand PLA+ physical test series to publish.
Is the price premium worth paying?
Take a straightforward example. A 60 g part consumes £0.90 of filament at £15/kg and £1.20 at £20/kg, before electricity, waste and labour. That is 30p more for the raw material. For an enclosure that would otherwise crack on the first drop, the difference could be trivial. For dozens of decorative prints with no mechanical requirement, it could be wasted money.
Those are illustrative prices, not live retailer quotes. The real print-cost guide shows how to account for supports, failed prints, machine time and the cost of getting a usable result.
Our buying rule is simple: use standard PLA while it satisfies the job. Pay more for a specific PLA+ or PLA Pro because its documented property addresses an actual weakness, and verify that property in the geometry you intend to use. If the problem is heat, chemical exposure, sunlight or substantial repeated flexing, look beyond the PLA family.
Sources
[1] eSUN: PLA+ technical data sheet, July 2025 (test methods, print conditions and properties)
[2] SUNLU official UK store: PLA+ 2.0 — recommended temperature ranges and product details
[3] Polymaker Wiki: Polymaker PLA Pro — current formulation, print settings and product transition
[4] Prusa Knowledge Base: PLA — strengths, printability and limitations