Marlin 2.0.8.2 is a maintenance release with a number of small improvements and issues fixed.

This release adds cap:HOST_ACTION_COMMANDS:0/1 to the M115 extended capabilities report so hosts like OctoPrint can check for basic host-firmware interaction with //action: commands. For more complete interactivity you should enable HOST_PROMPT_SUPPORT and this will report cap:PROMPT_SUPPORT:1 to the host.

New Machines and Boards

• ✨ Malyan M180 (#21992)

New Features

• ✨ MEDIA_MENU_AT_TOP for MarlinUI (#21925)
• ✨ Independent baud rates (#21949)

Host and Protocol

• 🚸 cap:HOST_ACTION_COMMANDS (#21987)

Configuration

• 🥅 Add MESH_EDIT_MENU sanity check (#21922)

Board / HAL

• 🐛 Fix BTT002 variant MMU2 serial pins 🧩 (#21980)
• 🐛 Fix Selena Compact probe pin (83f9413196)
• 🐛 Fix Octopus High Speed USB (#21961)
• 🐛 Fix MKS Robin E3 BLTOUCH and Fan PWM timer conflicts (#21889)

LCD / Controller

• 🌐 Update Polish language (#21993)
• 🩹 Improved SKR2 12864 LCD Delays (#21956)
• 📝 Update ExtUI example (f60965a107)

Optimized / Improved

• ♻️ LEDs refactor and extend (#21962)
• 🎨 Combined M104/M109 and M140/M190 code (e573611021)

Other Issues Fixed

• 🩹 Fix multi_volume + SDIO onboard compile (#21975)
• 🐛 Fix G29 K value (f1f622de01)
• 🐛 Fix EEPROM_CHITCHAT (#21934)
• 🐛 Fix flowmeter calculation (#21959)
• 🐛 Fix wrong Z_ENDSTOP flag bit (#21963)
• 🐛 Fix Toshiba FlashAir (SDCARD_COMMANDS_SPLIT) (#21944)
• 🐛 Fix DELTA with SENSORLESS_PROBING

Build and Upload

• ⚡️ PIO filters for M117, M300 and M414 (#21972)
• 🐛 Fix envs using mks_encrypt.py (#21933)
• 🐛 Fix compile with PREVENT_COLD_EXTRUSION off (94e67a036a)
• 🐛 Fix Teensy PINS_DEBUGGING compile (#21958)

For Developers

• 🎨 Macros for optional arguments (#21969)
• 🎨 Null heating message method (d1502f74ea)
• ♻️ Refactor axis homing/trusted state bits (57eef65d9c)
• ♻️ Minimize endstop bits (894c954e8f)
• 👷 Add a test for SAVED_POSITIONS (3220c49f1b)
• ♻️ Refactor, comment endstop/probe enums (4dae5890e9)
• 🎨 Flags for homing directions (e.g., Z_HOME_TO_MIN) (49b05ba989)
• 📝 Document diveToFile, printListing (ddc82b84e2)
• ♻️ Simplify TMC utilities for more axes (765720e98b)
• ♻️ Refactor axis counts and loops (26a244325b)

Maintenance

• 🎨 Apply shorthand and cleanups (7597b4fb40)
• 🎨 pause => pause_heaters (7cd0f2a32a)
• 🎨 Shorten lcd relative paths (3995e8373c)
• 🎨 Move HAS_EXTRUDERS (87a943756a)
• 🎨 Update a condition (8e28731f96)
• 🎨 Rename all/no axis enums (cdbd438a04)
• 🎨 MULTI_MANUAL => MULTI_E_MANUAL (c977e82074)
• 🎨 Move switch sensor strings (2de914c38c)
• ✅ Fix tests for EXTRUDERS 0 (046bac6769)
• 🎨 Misc cleanup and fixes (f7d28ce1d6)
• 🎨 Use defined strings (c85633b47f)
• 📝 Add Configurations section to README (#21955)