Spool Inspector
$69.49for selected items
Pairs with 3DSpoolTracker.com
Manage filament inventory, track remaining weight, and flash firmware from the free companion web app.
Visit 3DSpoolTracker.com →Features
- Weigh filament spools in real time with a precision load cell
- Automatically identify spools by scanning QR codes with the built-in camera
- 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 yourself. Requires some soldering. You will also need to 3D-print the enclosure parts — the STLs are on MakerWorld: Spool Inspector on MakerWorld.
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 Camera DIY Kit
Set 0 to skip any item you already have, or raise the count for extras.
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)
- PCB Set$16.00
$16.00 each
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
Tools you'll need
Includes the crimper plus extra housings and pins
For pressing brass inserts into 3D-printed parts
Klein 11057 — for stripping Dupont hookup wire
- Hex key / screwdriver set
M2, M3, and M4 — for mounting hardware
Consumables
~450g for the full enclosure, scale, and accessories
Links marked with the arrow are Amazon affiliate links — as an Amazon Associate we earn from qualifying purchases at no additional cost to you. See our privacy policy for details.
Includes 3 months of Pro — free.
Every pre-built Spool Inspector unlocks a free subscription to 3D Spool Tracker Pro (3 months for camera units and 12 months for RFID units). That includes full Reports & analytics, inventory export, and an unlimited AI-scan allowance. When your subscription, ends you keep all of your inventory and 20 AI scans/month, free, for as long as you own a device even if you don't renew. </p>
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.