PrusaLink cannot connect to MK3S+ (3.14.0) on RPi Zero W (PrusaLink 0.8.1) - Bugs & Errors https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/ Prusa3D Forum Discussion Board en-US Fri, 12 Jun 2026 08:29:42 +0000 wpForo 60 RE: PrusaLink cannot connect to MK3S+ (3.14.0) on RPi Zero W (PrusaLink 0.8.1) https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-789197 Mon, 13 Apr 2026 21:09:27 +0000 This is probably almost a year too late, and not sure if this is the same problem as you, but I saw the same error message after taking the SD Card out of a Raspberry Pi 5 connected via USB to my mk3s and plugging it into a Raspberry Pi Zero 2. I think prusalink attempts to connect via USB by default, and I had to manually tell it to look at the right port (via GPIO):

jo@mk3s:~ $ cat /etc/prusalink/prusalink.ini

port = /dev/ttyS0

Maybe this'll help someone!

]]> Bugs & Errors nmattia https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-789197 RE: PrusaLink cannot connect to MK3S+ (3.14.0) on RPi Zero W (PrusaLink 0.8.1) https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-749118 Thu, 08 May 2025 16:58:35 +0000 I can confirm the behaviour OP described, it affects both my MKS3 and MKS3+ with my Raspberry Pi Zero W 1.1.
Thank you @cookiecrook for bringing this up and providing a solution.

Sad this annoying bug persists for six month now.

]]> Bugs & Errors wolffm https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-749118 RE: PrusaLink cannot connect to MK3S+ (3.14.0) on RPi Zero W (PrusaLink 0.8.1) https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-725112 Tue, 22 Oct 2024 12:11:48 +0000 I've got an similar issue.

I'm using the following configuration:

- Original Prusa i3 MK3S+ Bausatz

- Raspberry Pi Zero for PrusaLink

- Firmware3.14.0-8066

- PrusaLink0.8.1

There were no problems when setting up the entire system. Even with the first 8-10 prints everything was fine. Only now, after switching on the printer, everything connects to PrusaLink, printing can be started but after half an hour to an hour the printer goes offline and printing stops. 

What could be the probelm?

]]> Bugs & Errors MM-SmartMachine GmbH https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-725112 RE: PrusaLink cannot connect to MK3S+ (3.14.0) on RPi Zero W (PrusaLink 0.8.1) https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-722351 Fri, 20 Sep 2024 23:07:03 +0000 A full downgrade of 0.8.1 to 0.7.2 resolved the issue... But then I updated again and it resolved itself in 0.8.1.

Working assumption is that it was a bad restore in RPi Imager, but I don't have a good explanation as to why it happened twice.

In any case, it's working for me now. in 0.8.1.

]]> Bugs & Errors cookiecrook https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-722351 RE: PrusaLink cannot connect to MK3S+ (3.14.0) on RPi Zero W (PrusaLink 0.8.1) https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-722308 Fri, 20 Sep 2024 13:49:32 +0000 Never mind, figured it out. You have to run the wizard locally by going to your ".local" address first. You cannot add it to Prusa Connect with the "Add Printer" button like you can with the other printers.

]]> Bugs & Errors Razor https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-722308 RE: PrusaLink cannot connect to MK3S+ (3.14.0) on RPi Zero W (PrusaLink 0.8.1) https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-722304 Fri, 20 Sep 2024 13:33:15 +0000  

Posted by: @b-o-b-3d-printing

Hi, I do have kind of the same problem with the prusa link 0.8.1.

I am into the point where my printer shows me the IP adress, but I cannot access it into my web browser...Do you solved your issue?

 

Same issue here. Were you able to fix this?

]]> Bugs & Errors Razor https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-722304 RE: PrusaLink cannot connect to MK3S+ (3.14.0) on RPi Zero W (PrusaLink 0.8.1) https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-721120 Sat, 07 Sep 2024 12:01:31 +0000 Downgrading PrusaLink to 0.7.2 resolves the issue for me.

]]> Bugs & Errors Christopher Frederickson https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-721120 RE: PrusaLink cannot connect to MK3S+ (3.14.0) on RPi Zero W (PrusaLink 0.8.1) https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-721075 Fri, 06 Sep 2024 20:11:30 +0000 I have the same issue.

Have a new RPi Zero W purchased from the Prusa Shop. RPi port is on. MK3S firmware is 3.14.0-8066. PrusaLink 0.8.1.

Getting the same: "/dev/ttyAMA0: NOT USABLE ... ✘" error.

]]> Bugs & Errors Christopher Frederickson https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-721075 RE: PrusaLink cannot connect to MK3S+ (3.14.0) on RPi Zero W (PrusaLink 0.8.1) https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-718563 Sun, 11 Aug 2024 19:15:24 +0000 Hi, I do have kind of the same problem with the prusa link 0.8.1.

I am into the point where my printer shows me the IP adress, but I cannot access it into my web browser...Do you solved your issue?

]]> Bugs & Errors B.o.B 3D Printing https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-718563 RE: PrusaLink cannot connect to MK3S+ (3.14.0) on RPi Zero W (PrusaLink 0.8.1) https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-717042 Tue, 23 Jul 2024 02:01:42 +0000 Of note, I'm also experiencing another problem, which may be related.

]]> Bugs & Errors cookiecrook https://forum.prusa3d.com/forum/bugs-errors/prusalink-cannot-connect-to-mk3s-3-14-0-on-rpi-zero-w-prusalink-0-8-1/#post-717042