Spool Inspector RF
$74.49for selected items
Smart filament spool tracker with real-time weight monitoring, camera-based QR code detection, OLED display, and a built-in web dashboard — plus a PN532 NFC/RFID reader for RFID spool tags. Track your filament usage across multiple spools with WiFi connectivity. (Beta)
Recognizes Bambu, Elegoo (PLA), eSun(when available), and any TigerTag encoded spool
Write your own RFID tags to label your spools
Features
- Weigh filament spools in real time with a precision load cell
- Automatically identify spools by scanning QR codes with the built-in camera
- Also reads RFID spool tags via the built-in PN532 NFC/RFID reader
- View weight, spool info, and status on the OLED display
- Monitor remotely via the built-in WiFi web dashboard
- Integrates with 3dspooltracker.com for multi-spool tracking and history
All electronic components needed to build a Spool Inspector RF yourself — everything in the standard DIY Kit plus a PN532 NFC/RFID reader board for RFID spool tags. Requires soldering. You will also need to 3D-print the enclosure parts.
Owning a Spool Inspector unlocks full Reports and 20 AI photo-ID scans a month in 3D Spool Tracker, free for as long as you own one — no subscription needed. (Without a device, the free plan gets 15 a month; Pro makes them unlimited.) Assembled units also ship with a code in the box for free Pro months — DIY kits do not include one.
Configure your DIY Kit
Set 0 to skip any item you already have, or raise the count for extras.
PCB Set$16.00$16.00 each
Pre-Programmed ESP32S3 Sense$26.00$26.00 each
- • 1× Pre-programmed Seeed XIAO ESP32S3 Sense
- • 2× 7-pin male headers (included from Seeed)
OV5640 $13.99$13.99 each
OLED 1306$3.50$3.50 each
5kg Load Cell$5.00$5.00 each
Piezo Buzzer$1.00$1.00 each
Heat-Set Insert Pack$1.25$1.25 each
- • 4× M4×8mm heat-set inserts (knurled brass)
4 available- Screw & Nut Pack$0.75
$0.75 each
- • 4× M2×4mm screws (PCB mount)
- • 4× M4×25mm screws + 2× M4 nuts (load cell)
- • 2× M3×14mm screws + 2× M3 nuts (OLED cover)
- • 4× M3×12mm self-tapping screws (housing to base)
LED Strip$2.00$2.00 each
100g Calibration WeightOptional$0.00$6.49 each
- USB-C CableOptional$0.00
$2.50 each
- 3D-Printed PartsOptional$0.00
$65.00 each
RFID Board$5.00$5.00 each
Every pre-built Spool Inspector RF unit includes a free year of Pro.
When the subscription ends you keep full Reports and 20 AI scans/month, free, for as long as you own the device - even if you don't renew.
On top of everything the free account contains, your Pro subscription includes:
- Reports and cost analytics — what you've spent, what your inventory is worth, cost per print, usage trends over time. Free accounts only see a summary.
- Unlimited AI photo scans — photograph a spool label and it fills in brand, material, color, and print settings automatically. Free accounts get 15, any device owner gets 20.
- Full data export and account backup — every spool as a CSV, or your entire account as a single file. Your data, yours to take.
- Unlimited paired Inspectors, so adding a second scale later costs nothing.
- Access to the public API and WebHooks so you can build your own integrations (Home Assistant, etc)
When the subscription is up, nothing breaks and nothing charges you. Reports and cost analytics stay unlocked and AI scanning continues at the 20/mo level for as long as you own the device. Everything you've entered stays exactly where it is.
For detailed specs, firmware updates, and documentation visit 3dspooltracker.com
Use at your own risk. Items sold here are hobbyist DIY electronics intended for experienced makers. Installation may involve soldering, modifying your 3D printer, and working with low- or line-voltage power. You are responsible for proper assembly, safe wiring, and use. We are not liable for damage to your printer or other equipment, personal injury, or other losses arising from installation, use, or failure of these products. By purchasing, you agree to assume all risk.