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Prusa i3 MK3S won't connect to any PC  

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Prusasg
(@prusasg)
Active Member
Prusa i3 MK3S won't connect to any PC

When I attempt to connect my Prusa i3 MK3S to a PC (I've tried 3, two with Windows 10, one with Windows 11) I receive a device manager USB error. It states there was a problem with the device and it could not connect. It lists the device and error in Device Manager as "Unknown USB Device (Device Descriptor Request Failed)" on all machines. I can't connect at all using the software nor can I update the device drivers to correct the issue in Device Manager. I've also tried 3 different USB cables to make sure that isn't the issue.

My firmware is 3.8.1. I tried a firmware reset to shipping ready but that didn't help. Is there any way I can update the firmware via SD card to see if that makes any difference or has anyone encountered this issue before? I saw one post in the forums but it was never resolved.

Please help!

Posted : 27/11/2022 11:40 pm
adesir
(@adesir)
Reputable Member
RE: Prusa i3 MK3S won't connect to any PC

Welcome!

Did you install the device driver with the full install of Prusa software?

https://cdn.prusa3d.com/downloads/drivers/prusa3d_win_2_5_0.exe

You cannot update the firmware via SD card, you have to use PrusaSlicer: https://help.prusa3d.com/article/firmware-updating-mk3s-mk3s-mk3_2227

 

Mes modeles publics
Posted : 28/11/2022 7:50 am
Prusasg
(@prusasg)
Active Member
Topic starter answered:
RE: Prusa i3 MK3S won't connect to any PC

Yes, I installed the drivers during installation. It still produces the device manager error. I've also tried uninstalling and reinstalling with no luck. I can still print from SD card so the device seems to be functioning but there is something broken about the ability to communicate over USB. 

Posted : 28/11/2022 7:57 am
JoanTabb
(@joantabb)
Moderator
RE:

can you check the LCD menu, and ensure that the internal raspberry pi function is turned off? 

when the raspi option is turned on, the  the serial communication is diverted to the RasPi port. 

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 : 28/11/2022 9:47 am
Prusasg
(@prusasg)
Active Member
Topic starter answered:
RE: Prusa i3 MK3S won't connect to any PC
Posted by: @joantabb

can you check the LCD menu, and ensure that the internal raspberry pi function is turned off? 

Good to know for the future, but I confirmed it Pi was turned off, turned off the printer, unplugged it, plugged it back in, turned it on with the USB connected and I am still getting the same error unfortunately. Really surprised no one else has ever had an issue with not being able to do a firmware update outside of a USB connection and that there isn't any sort of workaround. Any continued help would be appreciated. 

Posted : 28/11/2022 8:03 pm
towlerg
(@towlerg)
Noble Member
RE: Prusa i3 MK3S won't connect to any PC

Have you tried different USB cables?

Posted : 29/11/2022 12:38 pm
Prusasg
(@prusasg)
Active Member
Topic starter answered:
RE: Prusa i3 MK3S won't connect to any PC

 

Posted by: @towlerg

Have you tried different USB cables?

Yes, I've tried 4 different cables now. 

Posted : 29/11/2022 10:11 pm
towlerg
(@towlerg)
Noble Member
RE: Prusa i3 MK3S won't connect to any PC

Hve you googled

Unknown USB Device (Device Descriptor Request Failed)

If you do, you'll find a bewildering number of hits, for example here

Posted : 30/11/2022 2:58 am
Prusasg
(@prusasg)
Active Member
Topic starter answered:
RE: Prusa i3 MK3S won't connect to any PC

 

Posted by: @towlerg

Hve you googled

Unknown USB Device (Device Descriptor Request Failed)

If you do, you'll find a bewildering number of hits, for example here

Yes, unfortunately I've tried all the fixes listed there and have done quite a bit of googling. For example, I've tried adding to the registry for the specific device entry to specified values that are supposed to help without it working, tried uninstalling drivers , reinstalling drives/software, windows update search, CHKdisk, changing cables, changing power management settings, unplugging the printer for an extended period of time, different computers, limited firmware reset to shipping setting, different cables, different usb ports, etc.

Posted : 30/11/2022 4:07 am
towlerg
(@towlerg)
Noble Member
RE: Prusa i3 MK3S won't connect to any PC

Yes, unfortunately I've tried all the fixes listed there and have done quite a bit of googling. For example, I've tried adding to the registry for the specific device entry to specified values that are supposed to help without it working, tried uninstalling drivers , reinstalling drives/software, windows update search, CHKdisk, changing cables, changing power management settings, unplugging the printer for an extended period of time, different computers, limited firmware reset to shipping setting, different cables, different usb ports, etc.

That being the case I fear you are left with the fact that the USB port on the printer is probably borked. I don't suppose it's still in warranty?

Posted : 30/11/2022 2:39 pm
RandyM9
(@randym9)
Honorable Member
RE: Prusa i3 MK3S won't connect to any PC

Maybe time to try Prusa support.

Log into your eshop account and click the ‘chat’ button in the lower right corner of the screen. If you have trouble connecting you may need to disable any ad blockers.

Cheers

Posted : 01/12/2022 5:58 am
Hello
(@hello)
Reputable Member
RE:

Do any USB sticks Arduino eg connect. my Arduino wouldn't connect untill I factory reset computer and install drivers I had a problem where an app wouldn't allow USB connection. There are a lot of things on windows to make sure are right

Hope this helps 

Posted : 15/12/2022 6:56 pm
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