# Prusa Firmware Buddy v6.9.0 — 6.9.0 Firmware for Prusa CORE One+ (Gen 2) INDX, CORE One INDX

- Product: Prusa Firmware Buddy (https://whatsnew.fyi/product/prusa-firmware-buddy)
- Vendor: Prusa
- Date: 2026-08-20
- Version: v6.9.0
- Original notes: https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v6.9.0
- Permalink: https://whatsnew.fyi/product/prusa-firmware-buddy/releases/v6.9.0

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 converting the C1+ Gen 2 to INDX, including belt switching
- **added** — Add support for GT1.5 belts
- **added** — Add support for Expansion Joints Gen 2, featuring a significantly shorter heat-absorption phase on CORE One+ (Gen 2)
- **added** — Add automatic calibration of the nozzle cleaner
- **added** — Add Load All and Unload All options to the Filament menu
- **added** — Add filament sensor calibration and improve handling of the Not connected state
- **added** — Add the option to save crash dumps after a Red Screen event via Settings > System > Save Crash Dump
- **added** — Add a dedicated current profile for FLEX materials (M906 P2)
- **changed** — Move the bed down after Empty Waste Bin, and when pausing, stopping, or finishing a print
- **changed** — Preserve tool mapping when reprinting a job
- **changed** — Close the chamber grid automatically after a print is completed
- **changed** — Dim INDX head LEDs together with the chamber light
- **changed** — Reorganize the menu structure for improved usability
- **changed** — Reheat the nozzle in the nozzle cleaner when resuming a print
- **changed** — Adjust the purge point by +0.5 mm in Y
- **changed** — Relax the upper threshold for INDX nozzle presence detection to improve detection reliability
- **changed** — Adjust the nozzle presence decay threshold from 0.095 to 0.085
- **fixed** — Fix an issue causing an incorrect nozzle temperature to be displayed after a filament runout
- **fixed** — Fix an issue where auto-retraction could be triggered with a cold nozzle
- **fixed** — Fix cases where the bed did not move to the expected position after pausing, stopping, or completing a print

##### Summary

* **New features**

  * **New Edition: C1+ (Gen 2) → INDX Conversion Support** - Added support for converting the C1+ Gen 2 to INDX, including belt switching.
  * **GT1.5 Belts** - Added support for GT1.5 belts.
  * **Expansion Joints Gen 2** - Added support for **Expansion Joints Gen 2**, featuring a significantly shorter heat-absorption phase on CORE One+ (Gen 2).
  * **Automatic Nozzle Cleaner Calibration** - Added automatic calibration of the nozzle cleaner.
  * **Load All / Unload All** - Added **Load All** and **Unload All** options to the Filament menu.
  * **Filament Sensor Calibration** - Added filament sensor calibration and improved handling of the *“Not connected”* state.
  * **Crash Dump Saving** - Added the option to save crash dumps after a Red Screen event via **Settings > System > Save Crash Dump**. Crash dumps can help diagnose and debug user-reported issues.
  * **FLEX Material Current Profile** - Added a dedicated current profile for FLEX materials (`M906 P2`).

* **Improvements and Changes**
  * **Print State Bed Position** - The bed now moves down after **Empty Waste Bin**, and when pausing, stopping, or finishing a print.
  * **Tool Mapping Persistence** - Tool mapping is now preserved when reprinting a job.
  * **Chamber Grid -** The chamber grid now closes automatically after a print is completed.
  * **INDX Head LED Dimming** - INDX head LEDs now dim together with the chamber light.
  * **Menu Reorganization** - Reorganized the menu structure for improved usability.
  * **Nozzle Cleaner Resume** - The nozzle is reheated in the nozzle cleaner when resuming a print.
  * **Purge Point** - Adjusted the purge point by **+0.5 mm in Y**.
  * **INDX Nozzle Presence Detection** - Relaxed the upper threshold for nozzle presence detection to improve detection reliability.
  * **Ringdown Decay** - Adjusted the "nozzle presence" decay treshold from **0.095 to 0.085**.
* **Fixes**

  * **Incorrect Temperature After Runout** - Fixed an issue causing an incorrect nozzle temperature to be displayed after a filament runout.
  * **Auto-Retract with Cold Nozzle** - Fixed an issue where auto-retraction could be triggered with a cold nozzle.
  * **Bed Position After Print State Changes** - Fixed cases where the bed did not move to the expected position after pausing, stopping, or completing a print.

This is the stable release of firmware **6.9.0** for the Founders Edition Prusa CORE One/+ INDX, and Prusa CORE One+ (Gen 2) INDX. This release introduces firmware support for the new **CORE One+ (Gen 2)** hardware.

_***Note:*** **Firmware 6.9.0** is compatible only with Founders Edition Prusa CORE One/+ INDX, and Prusa CORE One+ (Gen 2) INDX._