How to Store and Track Your 3D Printing Filament
Wet filament prints badly and mystery spools waste time. Here is how to keep filament dry, label it well, and always know how much is left.
Two things quietly ruin 3D prints: filament that has absorbed moisture, and not knowing how much of a spool is left until it runs out mid-print. Both are easy to fix with a little organization.
Why moisture matters
Filament is hygroscopic - it pulls water from the air. Wet filament prints with stringing, popping, weak layers, and a rough surface. PETG, nylon, and TPU are especially thirsty, but even PLA degrades after weeks in humid air.
How to keep filament dry
- Store spools in airtight boxes or vacuum bags with desiccant (silica gel).
- Keep a hygrometer in the box; aim to stay below about 15-20% relative humidity.
- Dry already-wet filament in a filament dryer or a low oven before printing.
Always know how much is left
Running out 90% of the way through an overnight print is maddening. Weigh a spool and subtract the known empty-spool weight to get the grams remaining, then track usage per print so you can plan ahead and reorder before you run dry.
Label everything
A drawer of unlabeled spools becomes a guessing game. Note the material, brand, color, and ideal nozzle temperature - the settings you will want again the next time you load it.
Track it on your phone
Instead of sticky notes, Spool Log tracks each spool's remaining weight to the gram, logs every print with the material and grams used, and shows a color-coded low-filament ring so you reorder in time. It syncs across your devices with iCloud.