Unload filament heating also the bed.
After a print completed, and both the bed and extruder got cold, I selected "Unload filament" and picked PET. To my surprise, I saw the LED on the bed turn on, and the bed got heated too.
Why does the bed need to be heated if only the extruder is needed for the unload?
Is this a bug, a feature or this is how it works?
- Hello Roy,
This action is design Intent, but the designers have given you tools to negate the issue.
I use palette2 S Pro with My Prusa, and the Palette 2 slicer (Canvas) Always leaves a short stub of filament sticking out of the extruder, so I added the line shown below to My Custom Gcode, End Gcode, and now the filament is always ejected at the end of the print with no extra heat cycles.
Palette end Gcode sample
G1 E-100 F1000: Eject Filament Stub
M106 S0 ; turn off cooling fan
M104 S0 ; turn off extruder
M140 S0 ; turn off bed
G1 X0 Y200 ; part removal
M84 ; disable motors
M900 K0 ; reset linear advance to off by default
NOTE, the command could probably go anywhere in the End Gcode, but I chose to put it before the extruder was turned off...
if you put the line, in red, in your end Gcode, the filament will always be unloaded for you. (NOTE2! this is a Mk3/3S thread,
If you had a Mini, or a Mk2 with MMUv1 you would need to include a longer unload distance to account for the Bowden length.
Or you could set a small Gcode on your SD Card that Heats the extruder for you, ejects the filament and cools the extruder,
You could even add bleeps, to let you know when the filament is being ejected to save you having to monitor the LCD and press additional buttons.
- Or you could choose "Settings>Temperature>Nozzle" and then choose your temperature.
Or you could go to the Prusa Slicer Github page and re open the issues that have been raised by other people on this subject.
GitHub is where the Developers monitor issues.