# Prusa Firmware Buddy v6.8.1 — 6.8.1 Firmware for Prusa CORE One L+, CORE One L, CORE One+ (Gen 2), CORE One

- Product: Prusa Firmware Buddy (https://whatsnew.fyi/product/prusa-firmware-buddy)
- Vendor: Prusa
- Date: 2026-08-14
- Version: v6.8.1
- Original notes: https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v6.8.1
- Permalink: https://whatsnew.fyi/product/prusa-firmware-buddy/releases/v6.8.1

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Add support for CORE One+ (Gen 2) and CORE One L+ editions
- **added** — Add Nozzle Wiper support for cleaning the nozzle at print start
- **added** — Add GT1.5 belts support with transmission wheels
- **added** — Add Expansion Joints Gen 2 support with shortened Absorbing heat phase for CORE One+ (Gen 2)
- **added** — Add immediate stop on filament runout instead of finishing queued moves
- **added** — Add guided calibration order showing prerequisite calibrations
- **changed** — Reorganize menus with Input Shaper and Phase Stepping moved to Settings → Hardware
- **changed** — Move Printhead from Settings → Hardware to Settings
- **changed** — Move Lights from Settings → User Interface to Settings
- **changed** — Move Firmware Update from Settings to Info
- **changed** — Move Belt Tuning from Settings to Control → Calibrations & Tests
- **changed** — Move Chamber Fans Limit from Control → Temperature to Settings → Hardware
- **changed** — Move Display Refresh Speed from Settings → Hardware to Settings → User Interface
- **changed** — Move Loaded filament from Filament → Manage Filaments to Filament
- **changed** — Rename Temperature menu to Temperature & Fans
- **changed** — Run filament compatibility checks when filament is changed from print preview screen and in Change All Filaments
- **changed** — Allow lowercase letters in custom filament names
- **fixed** — Fix not restoring original temperature on filament runout or mid-print change
- **fixed** — Improve reliability of communication with xBuddy Extension
- **fixed** — Fix last file in folder not being visible and related file list issues
- **fixed** — Fix printer beeping on boot in Silent mode
- **fixed** — Fix upward swipe on touchscreen being registered as a tap

##### Summary

- **New features**
  - New editions: **CORE One+ (Gen 2) and CORE One L+**
  - **Nozzle Wiper** support, replacing the previous print-start nozzle cleaning routine
  - **GT1.5 belts** support
  - **Expansion Joints Gen 2** support, with a much shorter Absorbing heat phase [C1+ (Gen 2)] 
  - I**mmediate stop on filament runout**
  - Guided calibration order - calibrations and tests declare their prerequisites 
- **Changes and improvements**
  - **Reorganized menus** - some settings have been moved to different submenus 
  - Filament compatibility checks in more places 
  - Custom filament names may contain lowercase letters 
- **Fixes**
  - Fixed not restoring original temperature on filament runout/mid-print change 
  - More reliable communication with the xBuddy Extension 
  - The last file in a folder was not visible, and related file list fixes
  - The printer no longer beeps on boot in Silent mode
  - An upward swipe on the touchscreen is no longer registered as a tap 
  - And a lot more


This is the stable release of firmware **6.8.1** for the **Prusa CORE One**, **CORE One+**, **CORE One+ (Gen 2)**, **CORE One L** and **CORE One L+**, introducing firmware support for the hardware of the new **CORE One+ (Gen 2)** and **CORE One L+** editions, along with a reorganization of the on-screen menus, a guided calibration order and a number of fixes.

_Note: This firmware 6.8.1 is not compatible with INDX_

##### New editions: CORE One+ (Gen 2) and CORE One L+
Firmware 6.8.1 adds support for the hardware that ships with the new **CORE One+ (Gen 2)** and **CORE One L+** editions: the **nozzle wiper**, the **GT1.5 belts** and the second-generation **bed expansion joints** (non-L only, L has an AC bed). Each is described in its own section below.

The edition is selected in _**Settings → Hardware → Edition**_, which applies all of its hardware options at once. The individual toggles remain available for printers that have been retrofitted with only some of the accessories.

##### Nozzle Wiper
Printers fitted with the **Nozzle Wiper** clean the nozzle by wiping it across the wiper pad at the start of a print. This replaces the Nozzle Cleaning routine, which removed debris by tapping the nozzle against the print sheet.

_Note: A wipe can also be triggered manually with the G12 G-code. The wiper is enabled in _Settings → Hardware → Nozzle Wiper_._

##### GT1.5 belts
Printers now support the new **GT1.5 belts** and their transmission wheels, which move a slightly different distance per motor revolution than the original belts.

The belt type is set in _**Settings → Hardware → GT1.5 Belts**_. Changing it resets the belt tuning and the XY homing calibration, and restarts the printer.

It is important for the setting to match the actual belts installed. An incorrect setting makes prints come out dimensionally wrong and causes homing problems.

##### Expansion Joints Gen 2 [C1+ (Gen 2)]
The redesigned bed expansion joints let the frame reach a stable temperature considerably faster, so the **Absorbing heat** phase before a print can be shortened. With the second-generation joints enabled, the **Absorbing heat** is skipped entirely for bed temperatures up to 85 °C (PLA & PETG), and for higher bed temperatures the printer expects the frame to stabilize twice as fast, roughly halving the wait.

The joints are enabled in _**Settings → Hardware → Expansion Joints Gen 2**_.


##### Immediate stop on filament runout
When a filament runout is detected, the printer now stops immediately instead of first finishing the moves that are already queued. The end of the filament is therefore not driven as deep into the printer, where it could get stuck and be difficult to remove.

##### Guided calibration order
Calibrations and tests now declare which other calibrations they depend on. Starting one whose prerequisites have not passed yet shows a message listing which calibrations need to b

_[Truncated at 4000 characters — full notes: https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v6.8.1]_