How to track filament usage across prints

Wanting to track filament usage is usually triggered by the same event: a print fails at 90% because the spool you thought had plenty left didn't. The goal is simple — know how many grams each print used, and how many grams each spool has left — but most of the common solutions bolt a server or a spreadsheet onto that simple goal.

The options, honestly compared

• Slicer statistics. Your slicer reports estimated grams per print — that's the data source everything else uses. But the slicer doesn't know which physical spool you loaded, and its totals reset with each project. It's a per-print number, not an inventory.
• OctoPrint / Klipper plugins. Filament-manager plugins deduct usage automatically, which is great — if you run OctoPrint or Klipper, on every printer, and your printers are the only place filament gets used. Bambu, closed-firmware and offline printers are out.
• Spoolman. The most capable option, and the standard for self-hosters — but it's a server you install, maintain, and integrate with your printer stack. We wrote a full comparison.
• A spreadsheet. The forum-thread answer. Works for a week, then one unlogged print makes every number after it wrong, and there's no phone-friendly way to check the shelf from the printer.

Notice what all the automatic options share: they track the printer. If the printer didn't see the filament move, it doesn't exist. Multi-printer households, resin-and-FDM mixes, and anyone with a Bambu fall through the cracks.

Track spools, not printers

The alternative is to make the spool the unit of tracking, which is what SpoolVault does:

1. Add your spools once — pick a brand and type, tap every color you own, and save them all at once. Empty spool weights come preloaded, so this takes minutes, not an evening.
2. After each print, log the grams used per spool. The number comes straight from your slicer's print summary; multi-material prints report per-filament grams. Every spool's remaining weight updates straight away.
3. Re-weigh occasionally. Because remaining weight is anchored to real weigh-ins (see how much filament is left), drift never accumulates the way estimate-only systems do.

Because nothing talks to the printer, it works with every printer — Bambu, Prusa, Creality, Voron, the resin machine's FDM neighbor — and with the spools sitting sealed on the shelf, which no printer-side tracker even knows about.

What a running log gets you

• "Can I finish this print?" answered before you start — needed vs. available grams, per spool.
• Usage over time — how much filament you've burned this month, and which materials go fastest, straight from print history.
• Real costs — with purchase prices on your spools, every logged print gets a material cost automatically. More in the cost-per-print guide.
• Smarter restocking — you buy the colors you actually use, not the ones you fear running out of.