Guide
How to Fix Stringing in Your 3D Prints (2026)
Stringing is the oozing-nozzle problem: fine hairs stretched between towers, cobwebs bridging gaps that should be empty air, fuzz on walls that should be glass-smooth. It has exactly two root causes — either your settings are letting the nozzle drool during travel moves, or your filament is wet and steam is pushing melted plastic out for you. People routinely burn a whole weekend tuning retraction when the actual problem is the second one, and no slicer setting on earth fixes wet filament.
Diagnose before you touch anything
Listen to the printer. Wet filament announces itself: a faint popping or sizzling at the nozzle, sometimes a wisp of steam, strings that come out fuzzy and bubbly instead of fine and clean. Another giveaway is history — if the same profile printed clean two months ago and strings now, the settings didn't change. The filament did. Spools absorb moisture just sitting on a shelf, and PETG, TPU, and nylon are the worst offenders. Nylon in particular can pick up enough water in a couple of days to ruin prints.
If the printer is quiet and the strings are thin, glassy, and consistent, you have a settings problem, and the fix is free. Skip down two sections.
If it's wet filament, buy the fix
Moisture flashes to steam inside a hot nozzle and forces plastic out during every travel move. You're fighting physics with a checkbox, and physics wins. Drying is the only real answer, and a purpose-built dryer beats the oven-and-guesswork routine — kitchen ovens overshoot at low temperatures and have deformed plenty of spools.
SUNLU FilaDryer S4
Large dual-capacity dryer that fixes the #1 cause of failed prints: wet filament.
$60-80 · Amazon return policy applies
At $60–80 this isn't an impulse buy, but it earns its spot: it dries two spools at once and lets you print straight from the box, which matters more than it sounds — a freshly dried spool sitting in open air during a long print is quietly reabsorbing moisture the whole time. The controls are big and readable, and a lot of "mystery" failures (popping, weak layers, stringing that ignores every slicer change) trace back to exactly what this solves. The honest downsides: it claims real bench space, the fan is audible, and badly soaked filament dries slowly, so start it the night before rather than an hour ahead.
Skip it if you print only PLA in a dry climate and store spools sealed with desiccant. In that situation the money does more good elsewhere. Everyone printing PETG, TPU, or nylon — or anyone in a humid summer — will use it constantly.
If it's settings, tune in this order
Retraction first. Raise distance in small steps — direct-drive extruders need only a millimeter or so, Bowden setups several times that — and bump retraction speed alongside it. Go gradually: too much retraction causes its own misery, from heat-creep jams to gaps at the seam.
Temperature second. Hotter filament is runnier filament. Drop the nozzle 5°C at a time and reprint a stringing test between changes. Stop when strings fade or layers start looking under-bonded, whichever comes first.
Travel behavior last. Faster travel gives ooze less time to stretch into hairs. Combing keeps the nozzle over printed areas instead of crossing open gaps, and a wipe move parks the leftover ooze on the model's skin where you'll never see it. These clean up the last stubborn wisps after retraction and temperature have done the heavy lifting.
Bottom line
Diagnose first, spend second. Popping and sizzling means dry the filament — buy the dryer and stop tuning settings that were never the problem. Quiet printer with fine strings means retraction, then temperature, then travel settings, all free. Most stringing dies at one of those two doors, and knowing which door you're standing at is the whole trick.