Stringing — those thin hairs of plastic left between separate parts of a print — is usually the first real troubleshooting problem a new 3D printer owner runs into. The good news is it’s almost always fixable in an evening. The less good news is that a lot of the advice online treats it as a pure settings problem, when in our experience running a print farm daily, filament condition is just as often the actual cause.
What Causes PLA Stringing?
Stringing happens when molten plastic oozes out of the nozzle while it’s travelling between two points where it isn’t meant to be extruding — say, moving from one leg of a model to another. That ooze gets dragged into a thin strand as the nozzle moves, then cools in place.
There are three usual culprits: your retraction settings aren’t pulling the filament back far or fast enough between travels, your nozzle temperature is too high for the filament you’re using, or the filament itself has absorbed moisture and is off-gassing as it melts. Most stringing problems are actually a combination of the first two, with the third quietly making both worse.
How Do I Fix Stringing with Retraction Settings?
Start here, since it’s free and takes minutes. In your slicer, increase your retraction distance in small steps — for a direct-drive extruder, try increments of 0.5mm; for Bowden setups, increments of 1–2mm, since Bowden tubes need more retraction to compensate for slack in the tube. Increase retraction speed alongside it. Run a stringing test — most slicers (Cura, PrusaSlicer, Orca) have a built-in stringing test model, or you can print a simple tower with a few widely spaced pillars — after each change until the strings disappear or stop shrinking.
If you’re still stringing heavily after several rounds of tuning, the problem probably isn’t retraction anymore.
Is My Nozzle Temperature Too High?
Very likely, if retraction tuning hasn’t solved it. Printing PLA hotter than it needs to be makes the plastic thinner and runnier in the nozzle, which makes ooze — and therefore stringing — worse even with good retraction. Standard PLA typically prints well in the 190–210°C range depending on the specific filament and printer; try dropping in 5°C increments from wherever you’re currently printing and watch for stringing to reduce. If print quality (layer adhesion, surface finish) starts to suffer before stringing clears up, that’s usually a sign the filament itself needs attention rather than the temperature.
Can Wet Filament Cause Stringing?
Yes, and this is the cause we see most underestimated. PLA is hygroscopic — it pulls moisture out of the air over time, especially in humid conditions. When wet filament hits the hotend, the trapped moisture flashes to steam, which pushes tiny bubbles out through the nozzle along with the melted plastic. That extra pressure and turbulence at the nozzle tip makes oozing — and stringing — noticeably worse, even with retraction and temperature already dialled in correctly.
The tell-tale signs of wet filament go beyond stringing: audible popping or crackling sounds from the hotend while printing, a rougher matte texture on surfaces that should be glossy, and small surface bubbles or voids. If you’re seeing any of those alongside stringing, moisture is very likely part of the problem.
How Do I Know If My Filament Is Wet?
Beyond the printing symptoms above, check how the spool has been stored. Filament left unsealed in a humid room, especially over a South African summer, absorbs moisture faster than most people expect — this isn’t a rare edge case here, it’s close to the default outcome for anything left open on a shelf for a few months. If your spool has been open and unsealed for more than a few weeks, or you’re printing during humid months, it’s worth treating moisture as a suspect even before you’ve confirmed it visually.
How Do I Dry Wet PLA?
A filament dryer or a food dehydrator set to a low temperature (typically 45–55°C for PLA, checked against the specific filament’s guidance) for 4–6 hours will drive out absorbed moisture in most cases. If you don’t have a dedicated dryer, an oven on its lowest setting with the door slightly ajar can work in a pinch, though it’s harder to control precisely and carries more risk of overheating the spool. Store dried filament in an airtight container with desiccant afterwards — drying it once and putting it back on an open shelf just starts the clock again.
Does Cheap Filament String More Than Quality Filament?
Often, yes — though “cheap” and “quality” aren’t perfectly correlated with price alone. Inconsistent filament diameter causes uneven extrusion pressure, which shows up as stringing even with good settings. Poor packaging — filament shipped or stored without a proper moisture barrier — means it may already be partially wet before it even reaches your printer, regardless of how carefully you store it afterwards. We vacuum-seal our filament for exactly this reason: a spool that starts dry stays dry for longer, and it’s one less variable to troubleshoot when something goes wrong.
What If I’ve Fixed Settings and Filament and It’s Still Stringing?
At that point look at two remaining things: your nozzle for partial clogs or wear (a worn nozzle can dribble even with perfect settings), and your travel speed — very slow travel moves give oozing plastic more time to form a string before the nozzle moves away. Speeding up non-printing travel moves in your slicer can help even when everything else is correctly tuned.
Is Some Stringing Normal?
A small amount of very fine stringing that brushes off easily with a finger or a heat gun is common even on well-tuned printers and isn’t something to chase to zero. The goal is minimising it to that level, not eliminating every last hair — chasing perfection here usually means over-tuning retraction to the point where you start seeing under-extrusion at the start of new features instead.
Shop our Creality PLA range (vacuum-sealed at source), from R295/kg