Spoolroom: Filament Tracker

Enough filament for your next print? Spoolroom is filament inventory and print tracking for 3D printing. Weigh a spool to measure what is left, check a sliced file against your shelf before you start, and record what each print used and cost.

Spoolroom has a free plan for up to 50 active spools and 1 printer. Hobbyist and Workshop subscriptions and extra AI credits are optional in-app purchases.

HOW THE NUMBERS WORK
- A weigh-in is measured: put the whole spool on any kitchen or shop scale and Spoolroom subtracts the empty spool. That empty-spool weight is measured if you weighed one, or estimated from the catalog.
- A logged print subtracts an estimate, from the sliced file or the printer. Weigh again any time; the weigh-in replaces the estimate with a measured balance.
- Each spool shows when it was last weighed, or that it was never scale-verified, and its history keeps every weigh, print and correction.

KNOW WHAT IS ON THE SHELF
- Every material and color in one list, grouped by brand, with the total on hand by material.
- A short list of what needs attention: spools running low, due for a weigh, or due for drying.
- Where each spool lives: shelves, dryboxes, bins.

ADD FILAMENT
- Search the catalog or type it in, and check every field before it is saved.
- Or photograph a spool label, a box or a receipt: the assistant fills in the spools and you confirm before anything is saved.

PRINTS, GRAMS AND COST
- Drop in a sliced file to see whether your spools cover each color before you start, with a safety margin.
- Log the print from that file or by hand. Each print records its estimated filament use per spool and tool head, with filament and power cost.
- Maintenance reminders by print hours or days, with a record of the nozzle, belt or other supply you used.

OPTIONAL PRINTER WATCHER
- On supported printers, the watcher logs each finished print and subtracts its estimated use from the spool loaded in that slot. When it cannot tell which spool was used, the print waits for you to choose.
- It runs on an always-on computer on your printers' network, such as a Raspberry Pi or a mini PC, and only reads. Adding, weighing and logging prints by hand all work without it.
- Tested with a real printer: Snapmaker U1 and Elegoo Centauri Carbon 2. Experimental (built from published documentation, not yet tested on a real printer): other Klipper/Moonraker printers, Creality K1 (rooted), Anycubic Kobra, Bambu Lab, Creality stock firmware, Prusa (PrusaLink), Elegoo Centauri Carbon (first gen), FlashForge, and OctoPrint.

FILO, THE ASSISTANT
Tell Filo what happened at the bench, such as "used 85 g of the black PETG", and it prepares the change. Nothing is written until you tap confirm, and weighs and print deductions can be undone. Photos and messages go to the AI provider only after you allow it.

Photo intake, receipt reading and Filo use AI credits. On the free plan you can get 25 AI credits once, to try them. Hobbyist adds 100 credits a month, Workshop 1,000. Everything else works with AI off.

LABELS, SUPPLIES AND NOTES
- Print QR labels for your spools; scan one with the phone camera to open that spool.
- Track supplies too: magnets, heat-set inserts, glue, nozzles and build plates, with low-stock warnings.
- Keep printing notes and recipes next to the filament they belong to.

ON ANDROID
- Share a photo to Spoolroom from your gallery or Files to start adding a spool.
- Print labels through Android's print service.
- Long-press the icon to jump straight to Weigh, Add or Log print.
- On a wider tablet screen, the menu moves to the side and the shelf and spool pages use two columns.

YOUR DATA
Export everything at any time: a full JSON backup of every spool, print, supply and history entry, CSVs of your inventory and of your prints and costs, and a HueForge filament library. You can delete your account from Settings in the app; it closes at once and is permanently deleted 30 days later.

Questions or ideas: hello@spoolroom.app