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Christian Lund
(@christian-lund)
New Member
Can't rotate knob

Can't rotate knob

Hi I own a Mk3s with mmu2. I can't rotate the knob or rather nothing happens on the LCD screen it just stay put on the first line (Info Screen) so I can't choose print, heat or other menu items, the button does work.

This happend during af print and the print froze. I have not been moving my printer around or anything like that.

Can anyone help?

Postato : 25/04/2022 3:23 pm
Artur5
(@artur5)
Reputable Member
RE: Can't rotate knob

First check that the LCD cables on both sides (LCD board and Einsy board) are firmly plugged into their sockets. Maybe your problem is just a loose cable.

If you’re not lucky and the issue remains, then try wiggling sideways (softly) the knob, or pull it upwards just a bit while you rotate the wheel, to see if the scrolling function works, albeit intermittently.  

If the cables are OK, the rotary encoder might be defective; maybe a loose solder joint or a faulty internal contact.

On any case, I’d contact Prusa support via chat. They will be able to locate the exact source of the problem. If the rotary encoder failed and your printer is still in warranty, you should be entitled to a free new LCD board.

Postato : 25/04/2022 6:11 pm
doctorg
(@doctorg)
Eminent Member
RE: Can't rotate knob

+1 for checking the cables. Loose or disconnected cables are often the common culprit of many minor issues in the computing world. Though this behavior is very odd and it is unlikely a cable wiggled loose unless you had a lot of weird vibration, or maybe it got tugged on during the electronic portion of the MMU2 upgrade.

Postato : 26/04/2022 8:57 pm
Zoltan
(@zoltan)
Utenti Moderator
RE: Can't rotate knob

HI

I have deleted your post from Prusa MINI, I hope you don´t mind.

Iwould suggest

1. Do a factory reset

if this does not help

2.Try to reload the Printer firmware

3. If you have very old MK3 it could be the knob issue, but I dod not asume, it will start not to work suddenly - it goes with some degradation, skipping some steps, before it stops forever.

even an old man can learn new things 🙂
Standard I3 mk3s, MMU2S, Prusa Enclosure, Fusion 360, PrusaSlicer, Windows 10
PRUSA MINI+ Prusalink + Prusa Connect

Postato : 28/04/2022 7:20 am
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