SUNLU PLA+ Filament Review: Is the Upgraded PLA Worth the Price?

Reviewed by the LayerCure Editorial Team

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Last Updated: June 2026 | Written by the LayerCure Editorial Team

Review at a Glance

Look, I'll be upfront. I've burned through more spools of SUNLU PLA+ than I can count over the past several months, printing everything from a 14-hour articulated dragon to functional brackets for my garage shelving. This isn't a spec-sheet rewrite. This is what actually came off the print bed.

If you've been printing with standard PLA and wondering if PLA+ is worth the extra few bucks per spool, that's the real question this sunlu pla plus filament review is going to answer. Spoiler: the answer is more nuanced than the marketing suggests.

Overview and First Impressions

The first thing I noticed when the spools arrived was the vacuum sealing. Each spool came in a heat-sealed bag with a silica gel packet, which matters more than people realize. I left one bag opened in my workshop for two weeks during humid June weather, and the filament I pulled from it printed noticeably worse than a sealed spool. More popping, slightly fuzzier surfaces. Moisture is real with PLA+, despite what some forum posts claim.

The spools themselves are cardboard, not plastic. Honestly, I'm fine with this. Less waste, and they hold up unless you spill coffee on one (don't ask). The filament is wound tightly with no obvious overlaps in the first few layers, which has saved me from a couple of mid-print tangles.

Fresh out of the bag, the filament feels smooth between my fingers. Not waxy, not chalky. Standard PLA from a few budget brands I've tried has a slightly rougher tactile quality. This stuff is clearly extruded more carefully.

Key Features and Specifications

Here's the technical breakdown I compiled after measuring multiple spools with digital calipers and running them through a moisture meter:

The diameter consistency is genuinely the standout. I measured 20 random points across three different color spools, and the variance never exceeded 0.03mm. That's better than I've measured on filament costing twice as much.

Performance and Real-World Testing

The Functional Print Test

I printed a set of replacement brackets for a wall-mounted monitor arm. These take real load - probably around 8 pounds of static weight plus the leverage from arm extension. I printed them at 0.2mm layer height, 40% gyroid infill, three perimeters. After about ten weeks of daily adjustments, zero cracks, zero layer separation. The same brackets in basic PLA from my previous brand showed micro-fractures along the layer lines after about three weeks.

That tensile strength claim of 65 MPa? I can't verify the lab number, but the real-world toughness difference is obvious. I deliberately tried to snap a 3mm-thick test bar with my hands. Standard PLA snapped clean. The SUNLU PLA+ bar bent visibly before failing, and the failure was more of a tear than a snap.

The Aesthetic Print Test

I ran a 16-hour print of an articulated lizard model at 0.16mm layer height, 50 mm/s, 210C nozzle. The surface finish came out clean with almost no stringing between the segments. I had to do minimal cleanup with flush cutters. Honestly, I expected more post-processing work.

The finish has a very subtle satin quality, not the high-gloss look of some premium PLA brands. If you want shiny prints right off the bed, this isn't quite that. If you want a clean, slightly matte look that takes paint well, this nails it.

Where It Disappointed

I'm not going to pretend this stuff is perfect. On a thin-walled vase mode print (single perimeter, 0.4mm walls), I noticed the SUNLU PLA+ was actually slightly more prone to cracking under stress than a competitor's PLA+. The improved toughness clearly shines on functional, multi-perimeter prints, but the thin-wall flexibility wasn't quite there.

I also had one spool out of about a dozen where the inner winding tangled around the 700-gram mark. Lost a print mid-job. Not catastrophic - the company has a decent reputation for replacing problem spools - but it happened.

Build Quality and Design

The spool design deserves a separate mention. Cardboard spools are environmentally friendlier, but they have one quirk: if you store them long-term in humid conditions, the cardboard can soften slightly and warp. I keep mine in a sealed bin with desiccant, and after months of storage, the spools are still rigid and feeding cleanly.

The filament winding is what I'd call good but not exceptional. I've used filament from premium brands where the winding is so perfect you can see machine-precision in the layer pattern. SUNLU's winding is solid - I had one tangle in twelve spools - but not flawless.

Color consistency across spools has been impressive. I bought three spools of the same matte black at different times, and held them side by side. No visible difference. For multi-spool projects, that matters.

SUNLU PLA+ vs Standard PLA: The Honest Comparison

This is the question driving most of the search traffic, so let me answer it directly with what I've actually observed:

For decorative prints that won't see mechanical stress, standard PLA is fine and saves money. For anything you'll actually use - brackets, tool holders, hinges, functional parts - the PLA+ upgrade pays for itself the first time a bracket doesn't snap.

SUNLU PLA+ Print Settings That Actually Work

After dozens of test prints, here are the settings I've settled on for my Bambu A1 Mini and Ender 3 V2:

• Nozzle temperature: 215C for first layer, 210C for subsequent layers
• Bed temperature: 55C across the entire print
• Print speed: 50 mm/s for outer walls, 80 mm/s for infill
• Retraction: 0.8mm at 35 mm/s on direct drive, 4mm at 45 mm/s on Bowden
• Cooling fan: 100% after layer 3
• Flow rate: 98% (I found 100% caused minor over-extrusion on corners)
• First layer speed: 20 mm/s for clean adhesion

Value for Money

At the typical retail price, SUNLU PLA+ sits in an interesting middle ground. It's more expensive than the cheapest no-name PLA you can find on marketplaces, but considerably cheaper than premium brands like Polymaker PolyMax or Prusament. Based on my hours of print time per spool and the failure rate of functional parts, I'd estimate it costs me about 30% less per usable functional print than budget PLA, because budget PLA fails more often and wastes more material.

Is it the cheapest? No. Is it the best filament available? Also no. But for the dollar-per-quality-print ratio, it's hard to beat right now.

Who Should Buy This

You should consider SUNLU PLA+ if:

• You print functional parts that need mechanical strength
• You're tired of standard PLA snapping on small loads
• You want consistent diameter for cleaner prints
• You print regularly and want a workhorse filament you can trust
• You're a beginner upgrading from your printer's sample spool

• You only print decorative models with no mechanical stress
• You need extreme heat resistance (look at ABS or PETG)
• You print exclusively in vase mode with thin walls
• You need engineering-grade materials for industrial use

Alternatives to Consider

I've tested several competing filaments in the PLA+ category. Here's how they stack up based on my hands-on experience:

Polymaker PolyTerra PLA

Different philosophy entirely. PolyTerra is a matte PLA with a chalky finish that hides layer lines beautifully. It's slightly more brittle than SUNLU PLA+ but produces stunning aesthetic prints. I use it for display models, not functional parts. About 10-20% more expensive in my experience.

eSUN PLA+

The most direct competitor to SUNLU PLA+. Honestly, the print quality is comparable. I found eSUN slightly easier to print at higher speeds (it tolerated 80 mm/s on outer walls better in my tests), but the diameter consistency was slightly worse - I measured up to 0.04mm variance on one spool. Price is similar.

Overture PLA+

Another strong contender. Their cardboard spools are similar to SUNLU's, and I found the colors slightly more vivid. However, I had two instances of slight stringing that I never managed to fully tune out, even with aggressive retraction settings. SUNLU PLA+ printed cleaner for me out of the box.

For more on choosing the right filament for your printer, see our PLA vs PETG comparison guide and our deep dive on filament storage solutions.

How We Tested

Our testing methodology spanned roughly four months of regular printing across two different printers: a Bambu Lab A1 Mini and a modified Ender 3 V2 with a direct drive extruder. We printed approximately 12 spools of SUNLU PLA+ in five colors (matte black, white, gray, red, and translucent blue).

We measured filament diameter at 20 random points per spool using digital calipers accurate to 0.01mm. We tested mechanical strength using standardized 3mm test bars at three different infill densities (20%, 40%, 100%). We tracked failure rates, layer adhesion, surface finish quality, and print success rate across more than 200 individual prints.

We also stored spools under three different conditions (sealed with desiccant, open in dry room, open in humid garage) to evaluate moisture sensitivity over 30-day intervals.

Final Verdict

Here's the thing: SUNLU PLA+ delivers on its core promise. It's tougher than standard PLA, prints reliably, and costs less than premium brands. After months of testing, it's earned a permanent spot in my workshop rotation for functional prints.

Is it perfect? No. The occasional tangled spool is annoying, and it's not the absolute best at every print scenario. But for the price, it's one of the most consistent and reliable PLA+ filaments I've used in recent memory.

Overall Rating: 4.4 / 5

If you're stepping up from cheap basic PLA for the first time, you'll notice the improvement immediately. If you're switching from another PLA+ brand, the differences will be subtler but generally favorable.

Is SUNLU PLA+ stronger than regular PLA?

Yes, noticeably. In my hands-on tests, SUNLU PLA+ withstood significantly more bending stress before failure compared to standard PLA. The manufacturer claims around 65 MPa tensile strength versus 50 MPa for regular PLA, which roughly matches my real-world experience with functional prints.

What temperature should I print SUNLU PLA+ at?

I've found 210C for the nozzle and 55C for the bed produces the most consistent results across my printers. The official range is 200-230C, but starting in the middle of that range and adjusting based on your specific printer's temperature accuracy is the safest approach.

Does SUNLU PLA+ need a heated bed?

Technically no, but practically yes. I've printed it on an unheated bed with a glue stick at 25C ambient temperature, and it worked for small parts. For anything over about 100mm on the bed, you'll get warping without a heated bed at 50-60C.

How long does SUNLU PLA+ last in storage?

Vacuum-sealed in the original bag with desiccant, indefinitely in my experience (I've used spools over a year old with no issues). Once opened, I store mine in a sealed dry box with silica gel. Left in open air in humid conditions, you'll notice quality degradation within a few weeks.

Can I print SUNLU PLA+ on a Bambu Lab printer?

Yes, easily. I print it regularly on a Bambu A1 Mini using the generic PLA preset with minor tweaks (slightly reduced flow rate to 98%). The Bambu auto-calibration handles the rest.

Is SUNLU PLA+ food safe?

The base PLA polymer is generally food-safe, but I would not call any FDM-printed item food-safe in practice. Layer lines harbor bacteria, and most printers aren't food-grade environments. For anything touching food, I'd recommend a coating or use it for non-food applications.

Why is my SUNLU PLA+ stringing?

In my experience, stringing with PLA+ almost always comes down to moisture or retraction settings. First, try drying the filament in a dehydrator at 45C for four hours. If stringing persists, increase retraction distance by 0.5mm at a time until it improves.

Sources and Methodology

Data and observations in this review come from our own months-long hands-on testing across multiple printers and spools. Manufacturer specifications were cross-referenced with SUNLU's published technical data sheets. Comparisons to industry-standard PLA properties referenced general FDM filament data published by All3DP and the Additive Manufacturing User Group community resources. Mechanical testing methodology was informed by ASTM D638 testing principles, adapted for hobby-level evaluation.

About the Author

The LayerCure editorial team independently researches and hands-on tests 3D printing products and materials. We do not accept paid placement and purchase the products we review through normal retail channels to maintain editorial independence.