OpenSpool tag writer

Write filament details onto an NFC sticker from your phone, free. Tap it on an OpenSpool-compatible reader and your printer knows what's loaded.

Generic PLA

190–230°C nozzle · 50–60°C bed · 1000 g · 1.75 mm

Material

Colour

Brand

Finish (optional)

Nozzle min °C

Nozzle max °C

Bed min °C

Bed max °C

Filament weight (g)

Diameter (mm)

Tag data

{
  "protocol": "openspool",
  "version": "1.0",
  "type": "PLA",
  "color_hex": "E8572A",
  "brand": "Generic",
  "min_temp": "190",
  "max_temp": "230",
  "bed_min_temp": 50,
  "bed_max_temp": 60,
  "weight": 1000,
  "diameter": 1.75
}

214 bytes. Fits an NTAG215 (504 bytes) or NTAG216. Record type application/json.

How to use it

Open this page in Chrome on an Android phone with NFC turned on.
Pick the material and colour. Temperatures fill in for you; adjust them to your filament’s label.
Tap “Write tag” and hold your phone flat against a blank NTAG215 or NTAG216 sticker.
Stick the tag on the side of the spool.

Everything happens on your phone. Nothing is sent to our servers.

OpenSpool-compatible means this page writes the open OpenSpool data format; it isn’t affiliated with the OpenSpool project. Bambu Lab’s AMS and the Snapmaker U1’s stock firmware only read their own signed tags, so these tags need an OpenSpool-compatible reader or the U1 community Extended Firmware. What works with what.