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Inverted z-axis after firmware update  

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oblende
(@oblende)
Active Member
Inverted z-axis after firmware update

As the title says. I downloaded the newest prebuilt firmware and flashed it without issues, but when I homed the machine I discover that the z-axis is now inverted. Now, why did Prusa mess up the firmware like this, and what do I change in the source code to fix it?

Posted : 01/05/2020 11:53 pm
towlerg
(@towlerg)
Noble Member
RE: Inverted z-axis after firmware update

Wild guess - you have downloaded the wrong firmware for your printer.

Posted : 02/05/2020 3:05 pm
oblende
(@oblende)
Active Member
Topic starter answered:
RE: Inverted z-axis after firmware update

As much as I wish it could be my fault, and usually is, I'm pretty sure it isn't this time. Just to verify the file name for the I3 MK2 is: prusa3d_fw_3_2_3_MK2_MK2MMU.zip, correct?

Posted : 03/05/2020 12:46 am
JoanTabb
(@joantabb)
Moderator
RE: Inverted z-axis after firmware update

That would appear to be correct!

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 03/05/2020 12:58 am
oblende
(@oblende)
Active Member
Topic starter answered:
RE: Inverted z-axis after firmware update

Thanks for verifying, but that is also the problem. This is the firmware that I downloaded from Prusa's site, but the z-axis is now inverted. I reverted to the previous version of the firmware, and z-axis is acting as it should, but I'd really like to have the bug fixes in the newest firmware. I would really like to use either repetier-host or go full octoprint just so I can stop swapping the sdcard back and forth between the printer and computer.

Posted : 03/05/2020 1:44 am
JoanTabb
(@joantabb)
Moderator
RE: Inverted z-axis after firmware update

Have a word with Prusa Chat, they may have a suggestion. 

I am not at home at the moment because of lockdown. but I think I have this firmware on my Mk2 with MMUv1 ... 

However I can't see how the Z motors would be different... 

Extruders, Yes... 2 of the 4 extruders naturally turn one way and the other two turn the other way. if you accidentally wire them up 4,3,2,1 instead of 1,2,3,4... then all four extruders will run backwards! 🙂   (yes  I did that when I first built the MMUv1) 😀

Regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 03/05/2020 10:10 am
towlerg
(@towlerg)
Noble Member
RE: Inverted z-axis after firmware update

@oblende

"As the title says. I downloaded the newest prebuilt firmware and flashed it without issues, but when I homed the machine I discover that the z-axis is now inverted. Now, why did Prusa mess up the firmware like this, and what do I change in the source code to fix it?"

I'm missing something here, poster makes no reference to MMU but uses firmware for MMU?

Posted : 03/05/2020 10:57 am
oblende
(@oblende)
Active Member
Topic starter answered:
RE: Inverted z-axis after firmware update

The archive contains both the standard MK2 and MMU firmware in separate directories. Really this whole thing is strange.

Posted : 03/05/2020 1:27 pm
oblende
(@oblende)
Active Member
Topic starter answered:
RE: Inverted z-axis after firmware update

I have some further information on this subject. The Z-axis is not inverted. What happens is that when it homes it goes positive Z instead of negative Z to find the bed. So it's an error in homing not a direction inversion. Sorry about the confusion. So what has gone awry and and what should I change to get proper homing behavior?

Posted : 03/05/2020 9:27 pm
towlerg
(@towlerg)
Noble Member
RE: Inverted z-axis after firmware update

@oblende

Not wishing to flog etc. but do you have an MMU?

Posted : 04/05/2020 12:48 pm
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