Prusa Firmware 8.0.0: OpenPrintTag Update Guide

Direct answer: Prusa firmware 8.0.0 gives compatible CORE One printers something unusually practical: an NFC spool can tell the printer what material is loaded, how much remains and whether the planned job should fit. The printer then writes usage back to the tag. The important distinction is that the firmware update is broadly useful, while buying the separate OpenPrintTag reader only makes sense for a narrower group of CORE One owners.

Published November 9, 2026. GoodPrints has not independently tested the OpenPrintTag reader. Firmware behavior and compatibility are taken from Prusa's official release notes and product documentation; independent coverage is identified separately.

The update decision is straightforward. Owners of a supported Prusa should install the current stable firmware for its security fixes and reliability changes after normal backup and first-print checks. Buy the reader only if automatic single-spool identification and remaining-filament tracking would replace a real manual task. It does not currently work with INDX or MMU3, and several mid-print change paths bypass the tag.

Prusa OpenPrintTag NFC reader upgrade mounted under a filament spool holder — Prusa's OpenPrintTag reader sits beneath the spool holder and communicates over the printer's CAN bus. Product image: Prusa Research.

Verified firmware facts

Prusa published stable firmware 8.0.0 on November 3 for the CORE One family, XL family, MK4 family, MK3.9 family, MK3.5 family and MINI family listed in the release notes. It includes the security fixes introduced in 7.0.0, improves Prusa Connect connection setup, speeds firmware-controlled loading and purging of flexible filament, adds an enabled-by-default filament acceleration limit and fixes several crashes and calibration failures.

The NFC feature is more limited than the supported-printer list. OpenPrintTag reading and writing currently applies to the CORE One and CORE One L families with the compatible reader. Prusa explicitly excludes CORE One INDX and MMU3 at this stage. Firmware 8.0.1 later added two targeted fixes for MINI and XL machines; those owners should install 8.0.1 rather than stopping at 8.0.0.

GoodPrints' CORE One material guide remains the better reference for deciding whether the printer itself fits a material. OpenPrintTag can identify a stored profile and quantity, but it cannot make an unsuitable material safe or reliable for a specific part.

What OpenPrintTag actually does

When a tagged spool is loaded through the correct menu, the printer can read material name, color, brand, remaining weight and remaining length. It assigns identifiers to the material definition, package and individual spool. During printing, the firmware writes consumption back to the tag at most every five minutes, as well as at load, unload and job completion. Because the data lives on the tag, the remaining quantity can follow the spool between compatible printers without depending on a cloud account.

Before a job, the printer can warn that there is not enough tracked filament for the G-code. With SpoolJoin, the combined quantity check works only when every linked spool is tracked. The result is still an estimate based on recorded consumption, not a scale measurement; cut samples, failed loads or filament used outside the tracked workflow can make physical reality diverge from the stored number.

The OpenPrintTag project describes the format as open source, rewritable, reusable and offline by design. Its public specification includes reference code and is intended for adoption by other filament and hardware makers. That is more consequential than one branded accessory: a shared, local spool format could reduce setup mistakes without forcing makers into proprietary filament cartridges.

Company claims and purchase limits

Prusa says the reader can start the correct preheat automatically, reduce wrong-filament mistakes and preserve the remaining-material estimate on the spool. The reader mounts beneath the spool holder, connects to the xBuddy CAN port and supports the Prusa Drybox. Prusa also says new Prusament spools have carried rewritable OpenPrintTag tags since October 2025, while blank tags can be written with a phone for third-party spools.

Those benefits do not cover every workflow. Enabling an MMU turns the reader off. M600 changes and the Load or Change buttons in print preview use the material specified by G-code rather than reading the new tag. To make a tag-aware change, the operator must start from the Filament menu and choose Data From OpenPrintTag. CORE One INDX owners cannot use the reader yet.

The hardware also does not solve moisture exposure, tangled filament or poor storage. A spool can report enough grams and still print badly after humid storage. GoodPrints' guide to how long filament can stay out covers that separate decision.

What independent coverage confirms—and cannot yet prove

FilamentFeed's November 3 coverage independently reviewed the release documentation and highlighted the same practical boundary: firmware alone does not activate NFC, and the reader is presently a single-spool CORE One feature rather than an INDX or MMU workflow. It also noted the benefit for workshops moving spools between printers and the risk of treating a consumption estimate as a direct physical measurement.

GoodPrints did not find a published long-term independent test of the shipping reader before this article. There is therefore no independent evidence yet for missed reads, write reliability over many spool swaps, recovery after power loss or accuracy when operators frequently use manual changes. Those are the tests that will determine whether OpenPrintTag is a dependable shop tool rather than merely a convenient demonstration.

GoodPrints analysis: update the firmware, be selective about the reader

Update the firmware if your model is on Prusa's supported list, but read the model-specific notes and use the newest stable build offered for that printer. Security fixes, recovered accelerometer behavior, corrected loading errors, faster flexible-filament handling and INDX calibration improvements are useful even without NFC. After updating, verify heaters, fans, sensors and one known-good print before returning a production machine to unattended work.

Buy the reader when a CORE One or CORE One L runs one spool at a time, operators regularly switch materials, spools move between machines and a wrong profile or unexpectedly empty reel has a measurable cost. The local, rewritable and open format is a real advantage over cloud-linked or proprietary smart-spool systems.

Wait when you use INDX or MMU3, when most jobs run from one known spool, or when weighing reels already provides a reliable inventory check. The reader should remove work, not create a second database to reconcile. Shops that already manage jobs through Prusa Connect should also confirm how the added spool fields fit their current process; the related Prusa Connect assessment explains the broader remote-workflow tradeoff.

Firmware 8.0.0 is worthwhile because it improves ordinary printer behavior and makes an open spool standard tangible. The reader is not universal yet. Its best first use is a disciplined single-spool CORE One workflow where remaining-material data prevents real interruptions—and where operators understand that the tag records consumption rather than weighing the reel.