1.2.1 — Filament Unload fix
Fixes: pressing Unload heats the nozzle, then immediately cools without ejecting filament.
The Unload button was wired to a macro name that doesn't exist on the KE (UNLOAD_MATERIAL), so Klipper rejected it and nothing extruded. Now fixed to use the correct on-device macro, and existing configs auto-repair on first launch — nothing to edit. Also silences the harmless Unknown command lines unload printed in the console.
🙏 Thanks to ivru19 for the reports and logs that pinned this down.
(Everything below is unchanged from 1.2.0.)
Why the H.264 camera stream was removed (fixes the "black screen" freeze)
Several users hit a hard freeze on the KE — screen goes dark, SSH dies, only a power-cycle recovers it. We tracked this down to memory pressure, not a software crash.
The KE board has only 197 MB of RAM, and its swap is a file on the eMMC (not zram). The optional H.264 camera stream we shipped ran a go2rtc + ffmpeg transcode pipeline that used ~44 MB on top of Creality's own ~11 MB camera process. Under print load that pushed the box into swap-thrash on the eMMC, where it would lock up entirely.
This release removes the H.264 / go2rtc stream and reverts to the stock camera, which is the single biggest driver of the freeze. The lightweight image tuning (contrast/saturation via v4l2-ctl) stays — that costs no extra memory.
You do not need to do anything manually: on every install/upgrade, the installer now automatically migrates any existing go2rtc setup away — it stops the S96h264cam service, kills the go2rtc/ffmpeg processes, removes the init script and /usr/data/h264cam, and deletes the leftover "Nebula H264" webcam entry from Moonraker. Verified end-to-end on a live KE that had go2rtc installed: migration removed everything, the stock camera kept working, and ~32 MB of RAM was freed.
Changes
Removed
- H.264 / go2rtc camera stream (
k1_mods/h264cam) — the main cause of the dark-screen / dead-SSH freeze on the 197 MB KE (see above). Reverted to the stock camera.
Added
- Automatic migration on every install/upgrade that removes any existing go2rtc install (service, processes, init script, files, and the Moonraker webcam entry). Nothing to do by hand.
Fixed
- Manual Load/Unload not completing before auto-cooldown. Auto-cooldown was sending
M104 S0as soon as the command was queued, not when motion finished, so the heater dropped mid-retract and the filament jammed half-in/half-out. Cooldown now waits onM400(all extruder motion complete) before dropping the heater — applies to load, unload, extrude, and retract. - Stoppable Load rebuilt as a proper 2-phase feed: 80 mm fast approach (10 mm/s) + 50 mm slow purge (3 mm/s, matching the stock macro), still stoppable per chunk. Replaces the earlier flat 150 mm @ 5 mm/s feed.
Kept
- Creality Nebula camera image tuning (persistent contrast/saturation via
v4l2-ctl) — lightweight, no extra memory cost.
Upgrade: re-run the installer as usual; the go2rtc migration runs automatically. See the wiki Upgrading page for details.