Spool Scanner is a filament inventory and datasheet reference for any 3D printer user. Read Bambu Lab and Prusa OpenPrintTag spool tags natively, write blank NTAG stickers for every other brand, and track your whole stash with vendor-published technical data behind each material. Every spool gets a scannable identity.

NFC SCAN & WRITE
• Reads Bambu Lab MIFARE Classic tags: material, color, weight, recommended temperatures, drying schedule
• Reads Prusa OpenPrintTag spools (the open NFC-V smart-spool standard, used by Prusament and a growing list of brands): material, brand, color, weight, nozzle and bed temperature ranges, plus extras like serial, manufactured date, density, drying and GTIN
• Writes NDEF data to blank NTAG215 / NTAG216 stickers (about $0.10 each) so any other spool scans just like a smart spool
• Tag details view: copy any single field, or the whole decoded block, to the clipboard
• Rewrite weight after each print to keep inventory accurate
• Continuous scan mode for batch cataloguing

1,170+ MATERIAL VENDOR CATALOG
• 736 materials with vendor-published datasheets: density, tensile and flexural strength, heat-deflection temp, glass transition, melting point, drying recommendations, Shore hardness for TPU
• 100% datasheet coverage on Polymaker, Prusament, Fillamentum, eSun, Spectrum, Fiberlogy, MatterHackers, NinjaTek, Overture and Siraya Tech, with near-complete coverage on Bambu Lab
• Side-by-side Compare view picks winners on Mechanical, Thermal, Print and Dimensional rows
• Filter chips: food-safe, fiber-reinforced, flame-retardant, ESD-safe, biodegradable, UV-resistant, hardened-nozzle-required, high-temp engineering, soluble
• Min-HDT and min-tensile-strength threshold pickers for engineering selection
• Discontinued lines stay listed with a clear badge, so you can still look up spools you have owned for years
• Every figure is tagged by source, and estimated values are shown in italics, so you always know how confident a number is
• 7,000+ color entries with confidence cues (colorimeter-verified, vendor-published, image-extracted, or estimated)

SPOOL INVENTORY
• History of every spool scanned or written; edit weight, notes, price and location anywhere
• Per-print cost preview when price and original weight are tracked ("~5 used this print")
• Storage locations matching AMS / AMS 2 Pro / AMS HT, Creality CFS, Anycubic ACE Pro and Prusa MMU3, plus custom drying-box and shelf labels
• Bambu-Studio-style colored slot tiles show what is loaded where, with multi-color bands for tri- and quad-color spools
• Archive at empty (manual or automatic), with Active / Archived / All views and per-material consumed-grams totals
• "Your stats" page sums filament tracked, top materials, brands and colors, and total spend

QUALITY OF LIFE
• Search and filter by material, brand, color family, location or price
• CSV and JSON export and import with metadata for full round-trip backup
• Auto-backup every N scans, plus manual Backup-now and Restore from Settings
• Light, dark and system themes
• Photo-label OCR: snap a printed label to fill in a spool, with an optional force-preferred-brand mode for batch cataloguing

FREE TIER
• Scan Bambu Lab and Prusa OpenPrintTag spools forever, no limit
• Pick any 3 non-Bambu brands from the catalog
• Write 10 NTAG stickers free; rewriting the same sticker is always free
• Full history, search, filter, edit, archive, cost preview, locations and stats, with no time limit

PRO, $3.99 ONE-TIME
• Unlimited writes
• All 40+ brands unlocked
• Export, import, backup and restore
• Continuous scan mode

PRIVACY
• Inventory data stays on your device, never uploaded or sold
• Anonymous, opt-out usage stats help prioritize the next features
• No ads, no third-party trackers
• Privacy policy and one-tap data deletion link in the app

Works with any FDM 3D printer. NFC tag reading is Android-native; iOS restricts the MIFARE NFC class, so this app is Android-only for now.