An open standard, fully supported
OpenPrintTag is meant to be free of lock-in: any brand can adopt it and any tool can read or write it. SimplyPrint treats it as a first-class standard, reading and writing it on every platform - so the data you put on a spool stays with that spool, wherever it goes.
What OpenPrintTag is
OpenPrintTag is an open NFC standard from Prusa for storing filament data on a tag. It's rewritable and vendor-neutral, built on NDEF and ICODE SLIX, so it isn't tied to any single brand of printer or filament. New Prusament spools ship with an OpenPrintTag already on them, and you can write your own to any spool you like.
How to use OpenPrintTag with SimplyPrint
Three steps from a blank tag to a spool your printer recognizes.
Create an OpenPrintTag for any spool
OpenPrintTag is vendor-neutral, so you don't have to buy Prusa filament to use it. Write an OpenPrintTag to any spool you own in SimplyPrint and any OpenPrintTag-aware printer or tool, including Prusa printers, can read exactly what's loaded.
Read and write on every platform
OpenPrintTag is NDEF-based, so it works on iPhone, Android and the desktop NFC Agent alike - no MIFARE limitations here. On desktop, reading OpenPrintTag's ICODE SLIX tags needs a reader that supports them, like the ACS ACR1552U; the NFC Agent is the only method that handles ICODE SLIX.
About the desktop NFC Agent
Tap a tagged spool, see it instantly
The desktop reader identifies the spool in seconds
Hold a tagged spool to a USB reader running the SimplyPrint NFC Agent and the matching spool comes straight up - brand, material, diameter and remaining weight - ready to assign to a printer or view in full. No typing, no searching your inventory by hand.
Open standard, no lock-in
Because OpenPrintTag is open and vendor-neutral, what you write isn't trapped in one company's app. Tag a spool once and any OpenPrintTag-aware tool - including SimplyPrint - can read it. That's the whole point of an open standard: the spool carries its own identity, not a vendor's.
Ships on new Prusament, tracked automatically
New Prusament spools arrive with an OpenPrintTag already written, so SimplyPrint can pull the spool's identity straight away. From there, usage is deducted automatically from the G-code of every print you start - so the remaining weight on the record stays accurate without a scale.
How automatic tracking worksOpenPrintTag is not OpenSpool
It's easy to confuse the names, but these are separate standards. OpenPrintTag is Prusa's standard built on NDEF and ICODE SLIX; OpenSpool is a community DIY standard using NDEF on NTAG tags. SimplyPrint supports both, so you don't have to choose - but they're not interchangeable.
OpenSpool supportPlan access: what's included?
Reading OpenPrintTag and the filament manager are on every plan. Writing tags uses your monthly NFC-write allowance.
| Feature / Limit | Free | Basic | Pro | Print Farm | Enterprise | School | Cloud Slicer | Filament Manager |
|---|---|---|---|---|---|---|---|---|
|
Filament manager
Spool records and automatic usage deduction, on every plan including Free.
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NFC tag writes per month
How many NFC tags you can write to spools each month.
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10 | 30 | 100 | 10 |
Want to learn more about our plans?
View full pricing & feature comparisonFrequently asked questions
How do I use OpenPrintTag with SimplyPrint?
Can I create OpenPrintTag tags for non-Prusament spools?
Can I write OpenPrintTag from an iPhone?
Do I need a special reader for OpenPrintTag on desktop?
Is OpenPrintTag the same as OpenSpool?
Do new Prusament spools come with a tag?
Is OpenPrintTag rewritable?
Compatible OpenPrintTag hardware
OpenPrintTag uses iCode SLIX2 tags. On desktop, the ACS ACR1552U is the only reader that handles them - pair it with the free SimplyPrint NFC Agent for full read and write.
ACS ACR1552U (USB-C)
The only desktop reader that reads iCode SLIX2 / OpenPrintTag. USB-C, works on Windows, macOS and Linux.
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Prusa OpenPrintTag
Official OpenPrintTag tags from Prusa - the standard for open filament NFC data.
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iCode SLIX2 sticker tags
Blank iCode SLIX2 stickers, compatible with the OpenPrintTag standard. Write your own spools.
View productOn a phone, OpenPrintTag works on both iPhone and Android - no reader needed. The reader below is for desktop use.
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