Spool Inspector RF
$74.49for selected items
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
Configure your DIY Kit
Set 0 to skip any item you already have, or raise the count for extras.
PCBs with Dupont Connectors$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)
- 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 Spool Inspector includes free Pro — even the ones you build yourself.
The first time it weighs a spool, it unlocks 6 months of 3D Spool Tracker Pro — Pre-Built RF units get a full year. 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.
- 50 AI photo scans per month — photograph a spool label and it fills in brand, material, color, and print settings automatically. Free accounts get 15.
- 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 G-code storage for print tracking, instead of the 5-file free cap.
- 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.