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prusa3d / Prusa-Firmware

Firmware for Original Prusa i3 3D printer by PrusaResearch
GNU General Public License v3.0
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[BUG] Hotend cools off in Pause Print/ Change Filament #4516

Closed zeitung-ger closed 7 months ago

zeitung-ger commented 8 months ago

[MK3] [3.13.2] [NO MMU] [SD-Card]

Description Hotend cools down when I try to change the filament in the "Pause Print" Menu.

How to Reproduce When the filament sensor is turned off and the print paused, the heating of the hotend will shut off. Now when I try to change the filament, the extruder motor will not move at all, because the temperature is way too low. I can neither unload or load any filament. The only workaround is to go into the Tune Menu, manually turn up the Nozzle Temperature, unload/load filament and resume the print. This only started happening since the latest update.

Expected behavior The nozzle usually kept its temperature.

3d-gussner commented 7 months ago

@zeitung-ger Thanks for the bug report. This has been fixed and be available in the next release.

Tested with current MK3 branch build:

  1. Start SD print
  2. Pause print via LCD
    1. hotend will be set to 0°C and we not gonna change this to prevent cooking of the filament
  3. Wait until temp ~160°C (lower than clod extrusion)
  4. Tune -> Change filament
    1. reheats to previous temperature
    2. unload and load filament procedure
    3. back to pause state with hotend set to 0°C
    4. Wait for temp to drop to ~160°C
    5. Resume print
    6. heats the hotend to previous temp and continues to print.

Please consider to close this issue