Broken Startup Sequence
I just finished putting together my MMU2 upgrade for my mk3 and I want to calibrate the tube length. The problem is that the printer seems to run the startup sequence three times: when being powered, when finishing the startup of the mk3 and once you move the selector using the left or right button on the MMU. Sometimes it even fails to home the selector.
Because of this I'm not able to access the menu of the MMU unit and I'm not able to calibrate it.
I tried:
-Re flashing the firmware (both mk3 and mmu)
-checking all connections
Has anyone a Idea what causes this?
A Video of the Sequence: https://www.dropbox.com/s/i0r9vk5kttuzs ... 3.mp4?dl=0
Re: Broken Startup Sequence
Accessing the service menu to calibrate tube length instructions changed very recently.
The initial instructions I was trying didn't work due to a firmware change.
The manual info has been updated recently:
https://manual.prusa3d.com/Guide/Service+menu+-+Individual+Filament+Calibration/842
Review Step 3 and see if this is what you have been following.
When I followed the updated instructions I was able to successfully calibrate the tube length.
Re: Broken Startup Sequence
Thanks I didn't know that this has changed. I now got it working properly.
I still think the machine shouldn't try to run the startup sequence three times because I don't think that this is to good for the printer is there something I can do about it?
Re: Broken Startup Sequence
Thanks I didn't know that this has changed. I now got it working properly.
I still think the machine shouldn't try to run the startup sequence three times because I don't think that this is to good for the printer is there something I can do about it?
This is normal and intended behavior.
Homing the MMU steppers is necessary and should not cause any damage even if the noises can be alarming.
It's not really running the startup sequence three times. Prusa split the startup sequence into different parts so when you power up or reset the MMU it homes the idler. Then, when the printer first asks for a specific filament to be selected, the MMU homes the selector. They're doing it this way because if there's filament loaded at power-up, the selector can't home.