https://forum.prusa3d.com/forum/original-prusa-i3-mmu2s-mmu2-assembly-and-first-prints-troubleshooting/no-initializing-after-firmware-upgrade/ Prusa3D Forum Discussion Board en-US Tue, 09 Jun 2026 06:22:32 +0000 wpForo 60 https://forum.prusa3d.com/forum/original-prusa-i3-mmu2s-mmu2-assembly-and-first-prints-troubleshooting/no-initializing-after-firmware-upgrade/#post-121739 Tue, 25 Dec 2018 00:28:04 +0000 Upon homing using 1.0.3 ,when I load filament, my selector drives to the left, jams/grinds and stops to far left. That’s the homing sequence for me with 1.0.3 :lol:

Rgds]]> Assembly and first prints troubleshooting Incalculable https://forum.prusa3d.com/forum/original-prusa-i3-mmu2s-mmu2-assembly-and-first-prints-troubleshooting/no-initializing-after-firmware-upgrade/#post-121739 https://forum.prusa3d.com/forum/original-prusa-i3-mmu2s-mmu2-assembly-and-first-prints-troubleshooting/no-initializing-after-firmware-upgrade/#post-121738 Tue, 25 Dec 2018 00:27:00 +0000 Upon homing using 1.0.3 ,when I load filament, my selector drives to the left, jams/grinds and stops to far left. That’s the homing sequence for me with 1.0.3 :lol:

Rgds]]> Assembly and first prints troubleshooting Incalculable https://forum.prusa3d.com/forum/original-prusa-i3-mmu2s-mmu2-assembly-and-first-prints-troubleshooting/no-initializing-after-firmware-upgrade/#post-121738 https://forum.prusa3d.com/forum/original-prusa-i3-mmu2s-mmu2-assembly-and-first-prints-troubleshooting/no-initializing-after-firmware-upgrade/#post-121706 Mon, 24 Dec 2018 19:10:34 +0000 Look here:

https://shop.prusa3d.com/forum/general-discussion-announcements-and-releases-f53/firmware-1-0-3-for-the-mmu2-unit-t26512.html

The behavior is normal, he initializes upon loading. But the alignment for the selector seems to be wrong! The alignment works for me fine and haven't changed from 1.0.2 to 1.0.3. There must be something special on your unit.]]> Assembly and first prints troubleshooting Nikolai https://forum.prusa3d.com/forum/original-prusa-i3-mmu2s-mmu2-assembly-and-first-prints-troubleshooting/no-initializing-after-firmware-upgrade/#post-121706 https://forum.prusa3d.com/forum/original-prusa-i3-mmu2s-mmu2-assembly-and-first-prints-troubleshooting/no-initializing-after-firmware-upgrade/#post-121698 Mon, 24 Dec 2018 18:17:22 +0000
https://shop.prusa3d.com/forum/general-discussion-announcements-and-releases-f53/firmware-1-0-3-for-the-mmu2-unit-t26512.html

The behavior is normal, he initializes upon loading. But the alignment for the selector seems to be wrong!]]> Assembly and first prints troubleshooting Incalculable https://forum.prusa3d.com/forum/original-prusa-i3-mmu2s-mmu2-assembly-and-first-prints-troubleshooting/no-initializing-after-firmware-upgrade/#post-121698 https://forum.prusa3d.com/forum/original-prusa-i3-mmu2s-mmu2-assembly-and-first-prints-troubleshooting/no-initializing-after-firmware-upgrade/#post-121687 Mon, 24 Dec 2018 16:08:38 +0000 Hi,
I have a I3 MK3 printer working well. Now I'm finishing the installation of MMU 2.0. I've switched it on a couple of times, and could see the initialization "dancing" (the selector moved to the right and to the left). Also I could load two filaments. All seemed normal to me.
After that I made the MMU2 firmware upgrade, to 1.0.3-212, using the SLIC3R and the miniUSB, all succesful and verified on the display.
The thing is that now when I switch on the printer, the MMU remains still, it doesn't do the initial movements. It responds ok to left, right and load buttons, but I need to start the filament calibration process, and this is not possible without the initial movements. I also notice now tha filaments are loaded into the MMU, but never reaches the extruder.
Please help.]]> Assembly and first prints troubleshooting pedro.t3 https://forum.prusa3d.com/forum/original-prusa-i3-mmu2s-mmu2-assembly-and-first-prints-troubleshooting/no-initializing-after-firmware-upgrade/#post-121687