Firmware 6.4.0 hangs and z shift  

Firmware 6.4.0 hangs and z shift

I recently added the Prusa enclosure and switched to 5x obxidian nozzles (along with a firmware update) and it's been failed print after failed print since. At first I was convinced I'd screwed something up but fortunately I decided to dig around github before tearing the printer apart. 

First issue was layer shift upwards when changing toolheads. At first I only saw it on Hueforges with .08mm layer height with a certain printhead. Then with another printhead after rearranging filaments thinking it was mechanical.  But then I did a normal .2mm layer height print with a spool join and it did the same thing. So I put the hueforge project aside and went elsewhere.

Turns out there are ~4 different bugs related to Z shift here is one

https://github.com/prusa3d/Prusa-Firmware-Buddy/issues/4030

Second issue. Went to another print which was a larger one, 24 hours. At ~60% it just stopped printing, but said it was still active. Hit pause and it beeped and looked like it did something but nothing happens. Power cycle and it resumes with a layer shift, then does it again.

https://github.com/prusa3d/Prusa-Firmware-Buddy/issues/4998

On my 5T machine 6.4.0 has been a nightmare. Actually it seems every time I've updated to a 6.x firmware I've had issues, before it was the USB disconnect issue that haunted me through different versions, seems to be gone now and replaced with new ones. 5.1.2 was super solid though!

Sad because the hardware is great and it's an amazing printer when it's not failing due to some bug or another. 

Time to go back a version and see what issues features 6.2.6 has!